P0AFB - OBD Trouble Code

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The trouble code P0AFB can be described as Hybrid Battery System Voltage High. It is the engine control module which would monitor the correlation of the generator battery disconnect control module battery voltage and the starter generator control module (SGCM) output voltage to detect a 36-volt cable open or fuse/relay failure. The ECM also monitors to detect an over voltage situation and prevent the MOSFET (load dump). If either one of these conditions would be detected, then P0AFB trouble code would start appearing.

There are a lot of individual battery cells (sometimes over 300 cells) in the hybrid battery pack. The total voltage output of the hybrid battery pack is monitored by the hybrid powertrain control module. Now if the total output from the battery pack would be lower than what it should actually be, then the P0AFB fault code would be set. The high voltage system might stop functioning. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle to another.

What causes this problem with the Hybrid Battery System Voltage High?

• Defaults in the 36-volt battery cable
• Hybrid battery pack fuse is open
• There might be opened hybrid battery pack contactor
• There can be inoperative hybrid battery pack ground cable or connection

1. Hybrid Battery - A hybrid battery that has dead traction can be very problematic. It can result into a delayed or instant release of gases that are toxic or flammable. We recommend you to change it instantly without taking the risk of touching it as it may lead to a shock.
2. Engine Control Module - If there is any corrosion or breaks in the internal wiring of the harness, then it can cause a short in the ECM or can also cause corrosion in the ECM through the wiring harness. You can always rely on us as we have the best auto parts for our customers.
3. Inverter Cooler Pump - As part of the cooling system, the inverter coolant pump translates high-voltage direct current generated by hybrid batteries into alternating current for the motor to keep the system at the proper operating temperature. Thus, if the cooler pump if faulty, it should be replaced immediately.
4. Battery Temperature Sensor - A symptom commonly associated with a failing battery temperature sensor is an engine that surges during operation. The battery temperature sensor helps the system continuously adjusts the system voltage, and if it fails, this process may be disturbed. Thus, replace it now!
5. Powertrain Control Module - The onboard computer, or powertrain control module is the brain of the engine control system. Now if the brain is not working properly, then neither is the car engine. Get it replaced before the situation gets worse.
6. Electronic Control Unit - Is your car jump starting on reverse polarity? Or are you facing some intermittent starting issues? If yes, then it indicates that your electronic control unit is bad. So, it is very important to replace the defective electronic control unit with us at equitable prices.
7. Diagnostic Tool - Use high grade diagnostic tools and equipment to resolve OBD code error. Buy new tools and equipment form us now!

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P0AFB code by mentioning some major symptoms below:

Common Symptoms

• Illumination in the service engine soon light

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0AFB:

• You must fix the defective hybrid battery pack ground cable
• It is essential to restore the flawed hybrid battery pack contactor
• Rehabilitate the defaults in the 36-volt battery cable
• The malfunctioning PCM/ECM should be repaired or replaced as per the need

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Here are some steps which you should follow in order to diagnose this fault code:

• Use an OBD-II scanner in order to verify that the code is present, and check for other codes for any other type of error or problem that might need attention.
• The current data along with freeze frame data are recorded, and the codes are then cleared to see if they reoccur.
• The vehicle is inspected for any problems with the wiring and connectors to check for loose connections, corrosion, or shorts.
• The tests related to the hybrid battery system voltage and components may help pinpoint the problem, as well as inspection of the current sensor and cut off switch will further be helping the cause.
• The P0AFB error is triggered if there is a physical problem with the hybrid battery system parts which could cause the engine performance to go off.

Common Mistakes When Diagnosing The P0AFB Code

• There can be a failure in the battery energy control module (BECM)
• Defaults in the auxiliary 12V battery
• Some issues related to the high voltage battery assembly