P0636 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0636 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0636 code.

OBD II Fault Code

• OBD II P0636

OBD-II Code Battery/charging system warning light illuminated is defined as a Power Steering Control Circuit Low

Despite the code definition provided, most manufactures use this code to identify improper charging system operation. If the engine computer (PCM) detects the Alternator is not providing sufficient output to run the electrical systems on the vehicle and recharge the battery, code P0636 will set.Any non-essential electronics will also be disabled (i.e. Radio, Climate Control)

Battery/charging system warning light illuminated Symptoms

• Battery/charging system warning light illuminated
• Non-essential electronic devices will be turned off

Common Problems That Trigger the P0636 Code

• Alternator failure
• Powertrain Control Module (PCM) failure
• Wiring issue