C1116 Code? Here’s How to Fix It – Quickly and Easily

C1116 is a manufacturer-specific chassis diagnostic trouble code. Its exact definition depends entirely on the vehicle application, with Nissan and Infiniti using it for the stop lamp switch and other makes using it for starter circuits.

Because this error code can indicate a stop lamp switch fault, a starter circuit issue, or a suspension problem, exact application verification is required. The code alone does not prove a specific component has failed.

Key Takeaways

• C1116 is a manufacturer-specific chassis code with entirely different definitions across vehicle makes.
• On Nissan and Infiniti applications, it indicates a fault in the stop lamp switch circuit.
• On certain Ford applications, it points to a starter motor circuit failure.
• Diagnosis requires confirming the exact factory definition before testing any specific switches, relays, or wiring.

C1116 Code Description and Implications

Because C1116 is a manufacturer-specific chassis code, it does not have one universal definition. The monitored system and fault condition change depending on the exact vehicle application.

Nissan and Infiniti applications: C1116 indicates a stop lamp switch fault. The ABS and VDC control modules monitor the brake light switch signal to determine if the brake pedal is depressed. If the signal is missing or irrational, it sets C1116.

Ford applications: C1116 indicates a starter motor circuit failure. The powertrain or body control module monitors the starter relay control circuit for opens or shorts during a crank request.

Land Rover and Jaguar applications: C1116 may indicate a torque or pressure signal compare failure in the dynamic response or suspension system.

Note: Some generic databases incorrectly list C1116 as an ABS pump motor fault. On Nissan and Infiniti vehicles, the ABS pump motor code is typically C1111.

Common Causes of the C1116 Code

For Nissan and Infiniti applications:

• A failed or misadjusted stop lamp switch.
• A blown stop lamp fuse.
• Damaged wiring or poor electrical connections at the brake pedal assembly.
• A missing or broken brake pedal stopper pad.

For Ford applications:

• A failed starter motor relay.
• Open or shorted wiring in the starter control circuit.
• An internal PCM or starter motor fault.

Symptoms Associated With C1116

Nissan and Infiniti applications:

• Illuminated ABS, VDC, and Slip warning lights.
• Brake lights failing to illuminate when the pedal is pressed.
• The vehicle entering a fail-safe mode, causing hesitation or lack of acceleration.

Ford applications:

• Illuminated Check Engine Light or warning message.
• The engine failing to crank or start when the key is turned.

Diagnosing the C1116 Trouble Code

Diagnosis must begin by confirming the exact factory definition for your specific vehicle make, model, and year.

For Nissan and Infiniti applications:

Verify the operation of the brake lights. If they do not illuminate, inspect the stop lamp switch, its physical adjustment, and the related fuses. Use a scan tool to monitor the switch data parameter.

For Ford applications:

Inspect the starter motor relay and test the starter control circuit for proper voltage and ground during a crank request. Check for related battery or charging system codes.

Repairing the C1116 Issue

Repairs must follow confirmed diagnostic testing.

Nissan and Infiniti applications:

If the stop lamp switch is confirmed failed or misadjusted, replace or adjust the switch assembly. Clear the codes and perform any required steering angle sensor or ABS initialization procedures.

Ford applications:

If testing confirms a failed starter relay or damaged wiring, replace the relay or repair the harness.

Cost Considerations for C1116 Repairs

Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.

Replacing a stop lamp switch or starter relay involves minimal parts and labor. Diagnosing complex wiring faults or suspension pressure sensors requires more diagnostic time.

Prevention Strategies for Future Occurrences

On applications using a mechanical brake light switch, ensuring the brake pedal stopper pad is intact prevents the switch plunger from overextending and failing prematurely.

Inspecting exposed starter and chassis wiring can help identify developing damage or chafing before it causes an open circuit.

Troubleshooting Tips and Best Practices

Do not immediately replace the ABS pump or control module when a C1116 code appears on a Nissan or Infiniti. It is much more common for a simple, inexpensive brake light switch to trigger this code.

Always verify the exact definition for your specific make and model before ordering parts.

Check for technical service bulletins related to stop lamp switch adjustments or starter relay updates for your specific vehicle.

More OBD-II Codes

Frequently Asked Questions

Is C1116 a generic or manufacturer-specific code?

No. C1116 is a manufacturer-specific chassis code. Its exact definition depends on the vehicle make, with Nissan using it for the brake light switch and Ford using it for the starter circuit.

Can a bad brake light switch cause an ABS light and C1116?

Yes. On Nissan and Infiniti applications, the ABS control module relies on the brake light switch signal. A failed switch will trigger C1116 and illuminate the ABS and VDC warning lights.

Will disconnecting the battery clear a C1116 code?

Disconnecting the battery may temporarily clear the code, but it does not repair the underlying electrical fault. The code will return if the failed switch or damaged wire remains uncorrected.

Does C1116 mean my ABS pump motor is broken?

No. While some generic databases incorrectly list C1116 as an ABS pump motor fault, on Nissan and Infiniti vehicles, the ABS pump motor code is typically C1111, while C1116 relates to the stop lamp switch.

Can I drive my car with a C1116 code?

It depends on the application. If your brake lights are not working, driving is illegal and unsafe. On some vehicles, this code can also trigger a fail-safe mode that limits acceleration.

What Should You Do About the C1116 Code?

Confirm the exact factory definition for your specific vehicle application before attempting any repairs. Because C1116 monitors entirely different systems across manufacturers, applying the wrong diagnostic path will waste time and parts.

Once the correct system is identified, inspect the relevant stop lamp switch, starter relays, or related circuits according to the manufacturer procedure. Repair or replace the confirmed failed components, then retest the system to verify the repair.