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TuningBot DTC Database · v4.37.14

P1688 Diagnostic Trouble Code (4 interpretations)

4 manufacturer-specific interpretations across 4 manufacturers in the TuningBot DTC database.

P · PowertrainEngineOBD2
Brand pages:ChryslerDodgeHyundaiJeep

Chrysler

1 interpretation
P1688
Internal Fuel Injection Pump Controller Failure Chrysler · engine Data confidence 80%

The control module detected improper operation of the Internal Fuel Injection Pump Controller circuit. This is the manufacturer-specific definition used by Chrysler.

Recommended checks

  • Perform a full module scan
  • Review freeze-frame and occurrence data
  • Confirm the exact vehicle, ECU and software context
  • Inspect relevant wiring and connectors
  • Check applicable OEM service information

Dodge

1 interpretation
P1688
Internal Fuel Injection Pump Controller Failure Dodge · engine Data confidence 80%

The control module detected improper operation of the Internal Fuel Injection Pump Controller circuit. This is the manufacturer-specific definition used by Dodge.

Recommended checks

  • Perform a full module scan
  • Review freeze-frame and occurrence data
  • Compare commanded and measured values
  • Check applicable OEM service information

Hyundai

1 interpretation
P1688
Immobilizer Lock Hyundai · immobilizer Data confidence 62%

The control module detected a fault associated with the Immobilizer Lock circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Hyundai.

Jeep

1 interpretation
P1688
Internal Fuel Injection Pump Controller Failure Jeep · engine Data confidence 80%

The control module detected improper operation of the Internal Fuel Injection Pump Controller circuit. This is the manufacturer-specific definition used by Jeep.

Recommended checks

  • Perform a full module scan
  • Review freeze-frame and occurrence data
  • Confirm the exact vehicle, ECU and software context
  • Inspect relevant wiring and connectors
  • Check applicable OEM service information

Related and nearby codes

P16 range
P1600P1601P1602P1603P1604P1605P1606P1607P1608P1609P160AP160CP160DP160EP160FP1610P1611P1612

How to read P1688

P

Powertrain: engine, transmission and driveline systems.

1

Manufacturer-defined range: the meaning can differ between brands.

688

Specific fault index within the subsystem.

Frequently asked questions about P1688

What does P1688 mean?

Diagnostic Trouble Code (4 interpretations). The control module detected improper operation of the Internal Fuel Injection Pump Controller circuit. This is the manufacturer-specific definition used by Chrysler.

Is P1688 generic or manufacturer-specific?

P1688 is a manufacturer-specific code. In this database it is documented for: Chrysler, Dodge, Hyundai, Jeep. The same number can mean something different on other brands.

Can TuningBot remove P1688 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Immobilizer Systems and ECU Pairing

ECU tuningDyno-tested results by model and engine See the results →

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