Error Code P0AF8: What It Means & What To Do?

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Are you experiencing sluggish performance and acceleration? Is there a problem with the engine performance and affected fuel economy? All this with lights flickering on due to variable voltage may be due to vehicle battery problems leading to OBD code P0AF8 error getting stored in the PCM.

OBD-II Code High voltage system may not operate is defined as a Hybrid Battery System Voltage Error. The high voltage battery is composed of many individual battery cells. The Battery Energy Control Module (BECM) monitors all the cells in the high voltage battery pack to make sure they are all contributing equally to the high voltage system. If one cell is determined to be unequally contributing, code P0AF8 may set.

The Engine Control Module (ECM) monitors the Hybrid Battery System Voltage Circuit. The ECM sets the OBDII code when the Hybrid Battery System Voltage Circuit signal is out of factory specifications.

What causes this problem with Hybrid Battery System Voltage?

• Hybrid Battery Pack faulty
• Open or shorted harness to Hybrid Battery Pack
• Poor Electrical Connections to Hybrid Battery Pack

1. Engine Control Module - Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Powertrain Control Module - If the PCM is faulty, it can store wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus, replace it immediately.
3. Electronic Control Unit - If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
4. Diagnostic Tool - Choose from our diagnostic tools collection that will come in handy to detect and correct the OBD error code.
5. Battery Current Sensor - Defective car Battery Current Sensor can be a major reason why P0AF8 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
6. Car Battery - Everything is okay with the ECM and still OBD code P0AF8 triggering? Then there must be some defects in Car Battery. Replace them as soon as possible.
7. Battery Coolant Pump - P0AF8 code flashing? Get your Battery Coolant Pump inspected from a mechanic.
8. Hybrid Battery - Do you remember when was the last time you got your car Hybrid Battery checked up? A dirty Hybrid Battery can cause a lot of issues like displaying P0AF8 code.
9. Starter Motor - The engine will have problems with starting and will stall with the starter motor doesn’t work properly. Replace faulty motor now!
10. Car Battery & Cables - Damaged, corroded and faulty battery and cables can also be a reason for bad engine performance. Replace it now!

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0AF8 here:

Common Symptoms

• Light may stay on or work intermittently
• Sluggish Acceleration
• PCM faults
• Vehicle going into limp mode
• Reduced fuel economy

We have listed out some ways which would help you to correct the occurrence of OBD Code P0AF8. They are mentioned here as follows:

• It is essential to restore the flawed hybrid battery
• Repair or replace the quirky hybrid battery cut off switch circuit
• Carefully adjust the faults in the hybrid battery cut off switch
• The hybrid battery cut off switch harness should be restored to working order
• Recondition the non-functioning car battery
• It is necessary to perform proper service of the unsound battery current sensor
• Adjust the flawed hybrid battery cut off switch circuit

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0AF8 code to be stored:

• This is a general type of error code which is diagnosed with the help of a scanner.
• The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data.
• If he happens to find any additional error codes, he has to address them as well.
• Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears.
• If the error code does not return, then there can be an erratic condition.
• Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.
• Check for the damaged hybrid battery and its components for error. It the mechanic finds the fault in the connectors in relation to the battery, replace it immediately.
• Also check for the particular battery cells emitting high voltages and thus might need battery replacement as well.
• If all the components seem to work perfectly, inspect the PCM for faults and replacement along with reprogramming.

Common Mistakes When Diagnosing the P0AF8 Code

• Wiring and connector issues
• Hybrid battery cells issue
• PCM and ECU issue