Van lost power and limped home. 2016 Savana 2500

My van lost power and was cutting out so it limped home. Later, it started briefly, but it ran very badly. I change the TDC sensor, coil, ignition module, distributor pickup, and the distributor is three weeks old. 12v is where it is supposed to be, but the 9+V on the TDC sensor where it should have 0, is 5V. I’m just about out of ideas as to what to try. What do you suggest that I do to fix my van?
Experienced mechanics share their insights in answering this question :
As you may already know, trying to trace an electrical issue in when a vehicle goes into limp mode can be very frustrating and time consuming without having the use of a scanner. Nearly every vehicle when going into limp mode will have some kind of trouble code triggered, which will show up when having the computer scanned. I would recommend having this done in order to have a more precise plan as to what to repair. If you do not have access to this type of scanner I would recommend having an expert mechanic from YourMechanic come to your home to diagnose and repair the loss of power.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons a GMC Savana 2500 won`t start are a dead battery, an alternator problem, or failed starter.
Also known as `limp home mode`, limp mode is a security feature in cars which activates when the engine or transmission control unit picks up a fault. Once it detects a problem, limp mode will cause the less important parts of the car, such as air conditioning, to switch off, and the speed of the car will be reduced.
Limp mode is activated when the ECU (electronic control unit) notices that something is not operating within predefined parameters, this can be caused by a variety of factors such as: Extremely low levels of oil or coolant. Transmission errors – such as when the gearbox can`t change gears properly.
How to get a car out of limp mode? If your vehicle goes into limp mode while driving, find a safe place to stop and restart the engine. Allow the car to stay completely off for at least one minute before you restart it. In many cases, an engine restart will reset the limp mode and allow the vehicle to operate normally.
The most common reasons a GMC Sierra 1500 won`t start are a dead battery, an alternator problem, or failed starter.
If the car cranks when you turn the key, but the engine won`t start, it could be because fuel isn`t getting to the engine. One potential reason for this could be dirty fuel injectors. Over time, the fuel injector nozzles can become clogged with rust, corrosion or debris.
Check fluid levels – Low engine oil, transmission fluid, or coolant levels can sometimes trigger limp mode. Check the levels and top off if necessary. Dirty air filter – A dirty air filter will prevent the smooth flow of fresh air into the engine. Inspect your engine air filter.
The computer may have run out of the battery power used to store important information. If this isn`t computing correctly, the engine will sense a problem and trigger limp mode.
What causes limp mode? From faulty engine sensors, components or wiring, transmission issues, brake and clutch problems to a blown head gasket, or even low fluid levels, there are many reasons why your vehicle will enter limp mode.
Can an O2 Sensor even throw the car into limp? If it`s throwing the code for the o2 sensor it won`t go into limp mode, since the ecu recognizes a problem with the sensor it disregards that input.
Note: A transmission in fail-safe (or limp mode) will sometimes correct itself when the engine is shut off and restarted. So, if you find yourself in this situation, find a safe place to pull off the road and shut the engine off. Wait one minute and then restart the engine.
Battery issues, including the battery being dead or the terminals getting corroded, are the most common cause of this issue, and the first thing most mechanics will look at. Blown fuses and relays can cause this problem, too.
One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft. The computer uses the information from this sensor to know when to fire the spark plugs. If the sensor isn`t working, the spark plugs won`t fire, keeping the engine from starting.
Hard start symptoms and starter failure may NOT be caused by the starter, but could actually be caused by the crankshaft position sensor. If your vehicle is experiencing one or more of these symptoms, the crankshaft sensor may be at fault.
Fortunately (spoiler alert) the root cause of a no-crank is almost always simple. Most of the time it`s simply due to a low or dead battery, or voltage drop through a corroded connection. Rule those out before you suspect the starter itself.
Clear the check engine light

Use a reliable OBD2 scan tool to clear fault codes and reset limp mode. Just plug into your OBD2 port and search for the correct function.

On some vehicles, a bad crankshaft position sensor can create a no-start condition while for others it may trigger limp mode. Driving itself can become cumbersome with a bad camshaft position sensor, so it`s best to replace it.
Most alternators have an internal voltage regulator. If the voltage regulator fails, it will cause the PCM to not function properly and in turn cause the problems you were experiencing, such as the vehicle going into LIMP mode.
A severely dirty or clogged fuel filter can cause the vehicle to experience several engine problems: The engine`s computer ends up restricting the output to protect the engine from potentially damaging particles. The car may feel sluggish, or even go into limp mode and illuminate the Check Engine light.
Can a Bad Car Battery Cause Computer Problems? A faulty battery can have an impact on all of your automobile`s electronic components, including the car computer. If a malfunctioning battery is unable to provide the necessary electrical energy to a computer, it could result in issues.
This is because a car`s transmissions are operated through a computer system, which is powered by the battery. If the battery has corroded and the connections are starting to die, this may not shut the vehicle down, but can instead cause transmission problems off and on.
Disconnecting your battery and draining the power to cause an ECU reset is one of the most common fixes for a check engine light that won`t go away on its own. Doing so is equivalent to a hard reboot on a desktop computer, which is a standard way to eliminate many common problems.
Driving with A Failed Catalytic Converter

If you`re noticing slow powertrain performance, reduced acceleration, a smell of rotten eggs or sulfur from the exhaust, dark exhaust smoke, or extreme heat from under the vehicle, these are symptoms of a clogged Catalytic Converter, and it should be replaced quickly.

The short answer is yes. A clogged catalytic converter can cause your vehicle to lose power, causing frequent and harder steps on your gas pedal. A clogged converter combined with spark plug misfires can lead to the overheating of your engine.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Van lost power and limped home. 2016 Savana 2500
ANSWER : As you may already know, trying to trace an electrical issue in when a vehicle goes into limp mode can be very frustrating and time consuming without having the use of a scanner. Nearly every vehicle when going into limp mode will have some kind of trouble code triggered, which will show up when having the computer scanned. I would recommend having this done in order to have a more precise plan as to what to repair. If you do not have access to this type of scanner I would recommend having an expert mechanic from YourMechanic come to your home to diagnose and repair the loss of power.

While driving home from work my 2006 Nissan Pathfinder stalled and I lost power steering. I pulled over and restarted it. I t ran
ANSWER : Hi there. In situations like yours, it better money spent having the root source of your power steering failure correctly diagnosed; as in most cases, especially with modern power steering systems that a sensor failure or electrical glitch might be the source of your problem. It might be a good idea to have a professional mechanic come to your location to complete a steering wheel is hard to turn inspection. This will allow them to pinpoint the exact source of your problem and ensure the right repairs will be made the first time.

2012 equinox reduced power light engine light and traction light came on. Lost a lot of power got home and all light except engine
ANSWER : Your car has what is called a "safe mode" that will be engaged by the computer when it detects that something critical has gone wrong related to any of the major components in your engine chassis or power train. This may be related to a number of things, most of which should have been registered in the computer when the check engine light came on. I recommend having an expert from YourMechanic come to your location to inspect your check engine light and diagnose any codes registered by your vehicle’s computer.

My car died while on the freeway and I lost all power to my headlights, taillights, blinkers, power steering, windows and door loc
ANSWER : Hi there. Power to operate your vehicle during operation is supplied by the alternator. If you lost power to all systems, it will be caused by either the alternator failing, or an electrical relay or connection being damaged. Circuit tests should be performed to prove the failure(s). It could be that the fusible link(s) have burned near the battery positive cable. If the fusible link(s) have burned, the short that caused the failure needs to be identified. It could be a faulty ignition switch is the source of your issues as well. It would be a good idea to have a professional mechanic come to your location and complete an electrical components inspection so they can determine what is causing your problems.

Car lost power & stalled while driving on interstate – 2016 Hyundai Genesis
ANSWER : Hey there. I would recommend letting them diagnose the problem rather than just simply telling them to replace the fuel pump. The vehicle is under warranty since it is a 2016 model. For Hyundai warranty to pay the dealer for the repairs on your vehicle, they have to confirm the failure. If you tell them to replace the pump without further diagnostics, that will be on you if the pump does not fix the problem. If they diagnose that the pump is bad and that doesn’t fix it, then it is on the dealer. Unfortunately, with warranties the dealers hands are tied by the car company.

Engine went into "limp home mode with power train fault wrench indicated in dash. It will not accelerate. Not pulling any load.
ANSWER : Hi there. Your vehicle’s wrench light, Check Engine Light and lack of performance go hand in hand. The vehicle’s PCM (powertrain control module) has recognized a fault and put the vehicle into limp home mode. It could be, a throttle actuator problem or APP (accelerator pedal position sensor) problem. Accessing the vehicle’s computer for trouble codes may help identify the area of concern. It could be a fuel delivery or ignition system fault. There are a variety of component failures that could cause your vehicle’s drivability issue. I recommend having your vehicle’s lost of acceleration be diagnosed and repaired by a certified technician from YourMechanic.

Van loses power constantly – 2008 Dodge Sprinter
ANSWER : Is the Check Engine Light on, or is there any warning sign other than the power loss itself? One area to consider is to make sure all of the basic maintenance of the vehicle is up to date; This includes fluids, air filters and an ignition system tune-up. At 90,000 miles you should have serviced the engine oil and filter on a regular basis along with a fuel filter every 10,000 miles. The spark plugs, transmission fluid and transmission fluid filter were due to be serviced at 60,000 miles. Check your service records and if all of your services are up to date, and consider hiring one of our mobile experts for a personalized diagnosis and repair of your vehicle’s loss of power.

My vauxhall corsa electrics died and I lost power and power steering went I then bump started my car and would not rev and all lig
ANSWER : Hi there:

We don’t see a lot of Vauxhall Corsa’s here in the United States. You might want to have a professional mechanic complete an electrical problems inspection in your hometown to determine why you’re having these issues. Best of luck.