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P0629 is a diagnostic trouble code (DTC) for "Fuel Pump "A" Control Circuit High". 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.
When the vehicle’s PCM stores the P0629 code, it means that there is an issue with the “A” control circuit in the fuel pump.
Either the vehicle’s PCM, or another supporting control module, has found a problem with the fuel pump’s “A” control circuit. The supporting control modules include, but are not limited to:
If the fuel pump “A” control circuit is faulty, the P0629 code is stored. This often means that the malfunction is in a certain area of the system, as opposed to any one component or circuit. Usually, the P0629 code is caused by a defective fuel pump, or a problem with the fuel pump relay. Other causes include:
Symptoms of the P0629 code can include: * The code being stored
A malfunction in the fuel cap lamp
Check Engine Light comes on
If the Check Engine Light does not come on right away, the code may be pending.
The mechanic will focus on the CAN (controller area network) bus. This is what allows the various microcontrollers in the vehicle to communicate independent of a host computer. These microcontrollers regulate practically all of the vehicle’s electrical functions, and the PCM is the master controller.
It is possible for individual controllers to fail, but not common. So first, the mechanic will test each individual module, and replace as needed. The process starts with using an OBD-II scanner, and continues with several (but not necessarily all) of the following:
Repairs are sometimes unsuccessful if the communication failure is misdiagnosed. This is because the wrong component has been identified, and unnecessarily replaced.
This is not a life-threatening issue, but if not corrected, it could lead to more serious problems down the road. You do not have to get the problem fixed immediately, but should have it dealt with in order to avoid more expensive repairs later on.
A mechanic can fix or replace damaged wiring and corroded connectors, and replace any defective modules.
This type of problem often takes a long time to diagnose, and the wiring harnesses that need to be evaluated and/or repaired are very complex. Often, it is more cost-effective to simply replace any wiring that is suspect.
At YourMechanic, it will be our pleasure to send a mobile mechanic to your home or place of work. We will be glad to provide you with a free quote as well. To arrange an appointment, call us 1-800-701-6230, or use our convenient online form.