Common questions 

How do I fix code P0601?

Joe Ford

How do I fix code P0601?

The most common fix for this error code is replacing or reprograming the PCM. In some few cases, dealers may reflash the PCM and get it working. But most often than not, the code means the PCM must be replaced and reprogrammed. This is why it’s important that you take your vehicle to its dealership for this problem.

What is internal control module memory checksum error?

Diagnostic trouble code (DTC) P0601 stands for “Internal Control Module Memory Checksum Error.” It is triggered when the powertrain control module (PCM) detects an internal problem, typically a failed Memory checksum test. The PCM may not work properly if this part of its functionality has issues.

How do I fix code P0603?

Possible Solutions For Fixing the P0603 Code

  1. – Try Replacing your battery or alternator.
  2. – Replacing failed PCM or battery grounds.
  3. – Consider Replacing your PCM.

What are the signs of a bad PCM?

7 Common PCM Failure Symptoms

  • Your ‘Check Engine’ Light is On.
  • Your Car Won’t Start or Starts Roughly.
  • Sudden Loss of Gas Mileage.
  • You Failed Your Emissions Test.
  • Your Engine Stutters or Stalls.
  • Erratic or Random Shifting.
  • You’re Receiving a PCM-Related Error Code.
  • What to Do If You Experience PCM Failure Symptoms.

How do you know if a PCM relay is bad?

Symptoms of a Bad or Failing ECM-Power Relay

  1. No power when the key is inserted. One of the first symptoms of a problem with the ECM power relay is no power when the key is inserted.
  2. Engine will not start. Another common symptom of a problem with the ECM power relay is an engine that will not start or turn over.
  3. Battery drain or dead battery.

How much does it cost to have a PCM replaced?

The PCM controls more than 100 factors in your car, and for that reason, is very important – and expensive. A typical pcm replacement cost comes to between $500 and $1,500 on average.

How long does it take to reprogram powertrain control module?

30-40 minutes

How long does it take to replace a PCM?

The process takes around about half an hour, but keep in mind that most auto-electricians charge you for at least one hour of work. PCM reprogramming is also one of the few times we’ll recommend a dealership over an independent mechanic.

How can I make my car idle relearn?

Follow these steps to complete an Idle Relearn: Run the engine until it reaches normal operating temperature. Allow engine to idle for at least one minute. Turn the air conditioning on and allow the engine to idle for at least one minute. Release the parking brake.

When to do idle relearn?

When is Idle Relearn required? As mentioned above, Idle Relearn is required when the vehicle computer loses the connection to a throttle body. And, many things cause it to happen. Please note that it doesn’t mean that you will need the idle relearn after these repairs or incidents.

How do you reset engine idle speed?

Reset the IAC valve pintle position by performing the following:

  1. Depress the accelerator pedal slightly.
  2. Start the engine and run for 5 seconds.
  3. Turn the ignition switch to the OFF position for 10 seconds.
  4. Restart the engine and check for proper idle operation.

What is a relearn procedure?

Relearn procedures vary by manufacturer, so a technician must know if a relearn procedure is necessary to put the vehicle in “learn” mode. The three types of relearn procedures are auto relearn, stationary (manual) and OBD. The TPMS relearn process is created by the vehicle manufacturer, which follow a series of steps.

What is a throttle relearn?

After cleaning the throttle body on a GM vehicle, you may need to perform a throttle/idle relearn. Throttle relearn can also be done without a scan tool, essentially by letting the vehicle idle in park for several minutes and allowing time for the ECM to learn.

How do you relearn a crankshaft sensor without a scanner?

Crankshaft Learn Procedure (no scan tool)

  1. Turn off all of the accessories.
  2. Accelerate the vehicle to 55 mph at part throttle.
  3. Cruise at 55 mph for another 5-6 minutes.
  4. Decelerate to 45 mph without using the brakes, and maintain 45 mph for 1 minute.
  5. Perform 4 deceleration cycles, without using the brakes, of 25 seconds each where no specific speed is necessary.

What happens if you disconnect throttle position sensor?

Engine won’t idle smoothly, idles too slowly, or stalls If you start to experience engine misfires, stalling, or rough idling when the car is stopped, it can also be a warning sign of a failing TPS. …

How do you reset throttle position sensor?

The easiest way to reset your throttle position sensor is to unhook the negative cable from your battery for up to five minutes or to remove the fuse for your engine control module.

How do you fix a throttle position sensor?

How it’s done:

  1. Scan the computer system for codes.
  2. Test the throttle position sensor and related wiring.
  3. Remove and replace the throttle position sensor if found faulty.
  4. Clean the carbon from throttle body.
  5. Re-install throttle body and reset minimum idle speed to factory specs.