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P0655 is a diagnostic trouble code (DTC) for "Engine Hot Lamp Output Control Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0655 code means that the powertrain control module (PCM) has detected that there is an abnormal voltage reading coming from the engine hot lamp output circuit.
The P0655 is an OBD-II generic code which indicates that the circuitry meant to relay a pending engine overheat is experiencing a voltage-related malfunction. Typically, it means that there is a problem in the circuitry that operates this system.
A P0655 is caused by one of the following:
The P0655 code has few symptoms and will often only store the code. However, it may trigger a check engine light or a flashing engine temperature indicator.
The P0655 is diagnosed with an OBD-II scanner, and it is important to pay attention to other codes relating to engine temperature that may have been stored before the P0655. Freeze frame data is important to proper diagnosis, and resetting, road testing and retesting the vehicle is the next step. If the code returns, visually inspect the wiring and connections, replacing or repairing any components, fuses, wiring and connectors where needed. Retest the system and use the freeze frame data and codes to identify the issue.
It is highly recommended to use a manufacturer's suggested testing method when forced to diagnose individual control models. Replacing only as required, and reprogramming the PCM. It may be necessary to use an Autohex or Tech II scanner because of the complexity of the electrical system testing and then repair any open or shorted circuits as needed.
Diagnostic errors tend to occur when a mechanic does not compare their findings against a manufacturer's reference values. Additionally, it is important to perform a close visual exam to find any loose connectors that cause such codes as the P0655 to be stored. A common misdiagnosis is to replace the engine coolant temperature sensor though it is the PCM driver that is causing the problem.
The P0655 code will not prevent the car from starting, but it can be that the vehicle has a faulty sensor that could easily lead to an overheating issue.
The most common repairs used for P0655 are:
The PCM needs accurate data from the engine in order to control many other areas of the vehicle. This is why this code must be diagnosed starting with the PCM and the engine wiring harnesses, grounds straps or wires and all electrical connections. The CAN bus network is also a huge part of this repair, but you should not attempt to manually check the wires as a probe can cause multiple controller failures if used improperly.
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