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Error Code P062A is defined as Fuel Pump A Control Circuit Range/Performance. This is a generic trouble code, which means it applies to all vehicles equipped with the OBD-II system, especially those made since 1996 up to present. It commonly appears among Chevrolet, Chrysler, Dodge, Ford, Jeep, Mercedes Benz, Mitsubishi, and Nissan models, though it can also appear in other vehicle makes too. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another.
When Error Code P062A appears, this means the problem has been found in the fuel pump “A” control circuit. Specifically, this means the detected voltage within the circuit is outside the normal range, or there’s an ongoing performance problem. Damaged wires or connectors usually cause this within the circuit or the CAN (controller area network) bus. The PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) normally identifies this code, but other supporting modules can also spark up this code, such as:
- Alternative Fuel Control Module
- Fuel Injection Control Module
- Turbo Control Module
Depending on the make and model of the vehicle, it may take multiple drive cycles before this code is activated. It can also be an immediate result the second the PCM recognizes the fault.
The fuel pump plays a crucial role in the vehicle’s overall drivability. Without it, there would be no fuel being delivered to the engine. Depending on the driver’s needs, the control circuit is responsible for turning the pump on and off. An open condition within the circuit could also cause Error Code P062A, so take note of this issue with any diagnosis.
Other related trouble codes include:
As with other codes, this code activates the Check Engine light. Other common symptoms include:
- No start condition or engine starts but dies
- Engine cranks, but doesn’t start
- Engine dies when reaching operating temperature
- Engine misfire
- Engine stalling
- Increased fuel consumption
There are many possible causes for this code, such as:
- Fuel pump issues
- Damaged or severed ground wire in the device’s control module
- Unattached ground strap in the control module
- Open, shorted, or corroded CAN bus wires
- Defective CAN bus
- Unsecured harness and wires, resulting to broken or chafed circuit
- High circuit resistance (e.g. melted/corroded connectors, internal wire corrosion)
How to Check
As with most codes, the first thing to do when diagnosing this code is to check the vehicle’s year, model, and power plant with the TSB (Technical Service Bulletin). This can save a lot of time in the long run, as it helps you point in the right direction.
To get a good idea of the overall electrical condition of the vehicle and its modules, scan and test each module using OBD-II scanner. Also, make sure to do a visual inspection of the connectors and wiring to check whether there’s anything obviously damaged. Replace or repair as necessary. Many times, these damages are found under the vehicle, near the fuel tank. They can be susceptible to road debris and foreign elements, so make sure you pay close attention to those.
When dealing with any component with its own module (i.e., the fuel pump module, etc.), make sure to examine the ground circuits. You can do this using a separate battery ground. You can perform this using an auxiliary ground cable. If you can fix the problem using auxiliary ground attached, but the code still comes back when OEM ground is used, then this means your ground cable is causing the issue and must be repaired, if not replaced.
Grounds must be thoroughly checked for corroded connections. Terminals, pins, etc., could also cause resistance on the circuit. A good sign there’s excessive corrosion is when there’s a green ring around the connector that is attached to the battery terminal. If you see this, make sure you remove the terminal and clean all contact points, including the connector face and terminal post/stud.
Because this code is usually caused by an open circuit, it’s important to identify which specific circuit is at fault through the electrical wiring diagram using your service manual. Once you have found the culprit, you can then trace the individual fuel pump A control wire individually and check for any breaks in the wire. Repair as necessary, either by soldering the wire (recommended) or using butt connectors with heat shrink to insulate it from other elements.
Then, using your multimeter, measure the resistance between the connectors in the circuit to pinpoint the exact location of the short/open. If there’s a fault somewhere in the whole circuit, a power probe style tool is highly recommended.
How to Fix
- Repair or replacement of fuel pump or fuel pump relay
- Repair or replacement of open or shorted harness in the fuel pump
- Repair or replacement of poor electrical connections
- Repair of faulty fuel pump control module (if applicable)
It’s very possible that the problem can still be unresolved even when the Check Engine light doesn’t immediately light up. Thus, it’s extremely important to make sure the vehicle has gone through a few drive cycles (driving the car for a week) if the Check Engine light still doesn’t light up, the problem may still be unresolved.