P1688 Dodge Code - Internal Fuel Injection Pump Controller Failure
Quick Answer
Fuel Pump Control Module (FPCM) is monitored with ignition on engine off, and with the engine running. Common causes include Good Trip Counter Equals Zero, Faulty Fuel Pump Control Module (FPCM), Fuel Pump Control Module (FPCM) harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1688 Dodge indicates Internal Fuel Injection Pump Controller Failure.
- Common causes
- Common causes include Good Trip Counter Equals Zero, Faulty Fuel Pump Control Module (FPCM), Fuel Pump Control Module (FPCM) harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1688 Dodge Description
What are the Possible Causes of the DTC P1688 Dodge?
- Good Trip Counter Equals Zero
- Faulty Fuel Pump Control Module (FPCM)
- Fuel Pump Control Module (FPCM) harness is open or shorted
- Fuel Pump Control Module (FPCM) circuit poor electrical connection
How to Fix the DTC P1688 Dodge?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
Diagnosis And Testing
A rubber tipped blow gun with regulated air line pressure is needed for this test.
1. Clean area around overflow valve and fuel return line at injection pump before removal.
2. Remove valve from pump and banjo fitting.
3. Discard old sealing gaskets.
4. Set regulated air pressure to approximately 97kPa (14-16 psi).
5. Using blow gun, apply pressure to overflow valve inlet end (end that goes into injection pump).
6. Internal check valve should release, and air should pass through valve at 97 kPa (14-16 psi). If not, replace valve.
7. Reduce regulated air pressure to 10 psi and observe valve. Valve should stay shut. If not, replace valve.
8. Install new sealing gaskets to valve.
9. Install valve through banjo fitting and into pump.
10. Tighten to 30 N·m (24 ft. lbs.) torque.
Source: https://www.cumminsforum.com/forum/98-5-02-powertrain/450368-p1688-code-source.html#post4638821
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1688 Dodge code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1688 Dodge Code
1. What are the common symptoms of OBDII code P1688 in a Dodge related to internal fuel injection pump controller failure?
The common symptoms include rough idling, engine misfires, loss of power, and difficulty starting the vehicle.
2. What are the potential causes of OBDII code P1688 indicating internal fuel injection pump controller failure in a Dodge?
The code is commonly triggered by issues with the internal fuel injection pump controller, such as wiring faults, electrical issues, or a malfunctioning controller itself.
3. How serious is OBDII code P1688 related to internal fuel injection pump controller failure in a Dodge?
This code should be taken seriously as it can lead to poor engine performance, decreased fuel efficiency, and even potential engine damage if left unresolved.
4. Can OBDII code P1688 in a Dodge be repaired without professional help?
While some DIY enthusiasts may attempt to troubleshoot and repair this issue, it is recommended to seek professional help due to the complexity of diagnosing and fixing problems related to the internal fuel injection pump controller.
5. How can a mechanic diagnose OBDII code P1688 in a Dodge indicating internal fuel injection pump controller failure?
A mechanic will typically use a scan tool to read the code, conduct a visual inspection of the fuel injection pump and related components, and perform electrical tests to pinpoint the root cause.
6. What are the possible repair options for OBDII code P1688 related to internal fuel injection pump controller failure in a Dodge?
Repair options may include repairing or replacing the internal fuel injection pump controller, fixing wiring issues, addressing electrical faults, or recalibrating the controller as needed.
7. Is it safe to continue driving a Dodge with OBDII code P1688 indicating internal fuel injection pump controller failure?
It is not recommended to drive the vehicle with this code active, as it can lead to further engine damage and potential safety hazards on the road.
8. How much does it typically cost to repair OBDII code P1688 related to internal fuel injection pump controller failure in a Dodge?
The cost of repairs can vary depending on the extent of the issue, the parts needed, and the labor rates of the repair shop. It is advisable to obtain quotes from different mechanics for an accurate estimate.
9. Are there any preventive maintenance measures to avoid OBDII code P1688 in a Dodge due to internal fuel injection pump controller failure?
Regularly servicing the fuel injection system, checking for wiring issues, and addressing any electrical problems promptly can help prevent the occurrence of this code.
10. Can resetting the OBDII system clear the P1688 code related to internal fuel injection pump controller failure in a Dodge?
While clearing the code may temporarily turn off the check engine light, it will not fix the underlying issue. It is crucial to diagnose and address the root cause of the problem to prevent further complications.
Discuss the causes and fixes for P1688 Dodge OBDII Code
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Yes i replaced the filter housing for filter and the new one came with the heater connected to housing
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