P16D8 GMC Code - Sensor Supply Voltage Relay Control Circuit Low Voltage
Quick Answer
The Reductant Control Module Relay 1 & 2 supply ignition voltage to the Reductant Control Module. Common causes include Faulty Reductant Control Module Relay, Reductant Control Module Relay harness is open or shorted, Reductant Control Module Relay circuit poor electrical connection. 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
- P16D8 GMC indicates Sensor Supply Voltage Relay Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty Reductant Control Module Relay, Reductant Control Module Relay harness is open or shorted, Reductant Control Module Relay circuit poor electrical connection.
- 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 P16D8 GMC Description
The Diagnostic Trouble Code (DTC) will be set when the ECM detects an open circuit, short to voltage or short to ground on the Reductant Control Module Relay control circuit.
What are the Possible Causes of the DTC P16D8 GMC?
- Faulty Reductant Control Module Relay
- Reductant Control Module Relay harness is open or shorted
- Reductant Control Module Relay circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P16D8 GMC?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P16D8 GMC 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 P16D8 GMC Code
1. What are common symptoms of OBDII code P16D8 GMC (Sensor Supply Voltage Relay Control Circuit Low Voltage)?
- Common symptoms include poor engine performance, rough idling, stalling, and potential issues with starting the vehicle.
2. What can cause the OBDII code P16D8 GMC to trigger?
- The code may be triggered due to a faulty sensor supply voltage relay, damaged wiring in the circuit, or a malfunctioning sensor.
3. How serious is the OBDII code P16D8 GMC?
- While the code may not cause immediate danger, it can lead to poor vehicle performance and should be addressed promptly to prevent further issues.
4. How can I diagnose the cause of OBDII code P16D8 GMC?
- Diagnosis typically involves using a diagnostic scanner to read the code, checking the sensor supply voltage relay, inspecting the wiring, and testing the sensor's functionality.
5. What are some repair tips for fixing OBDII code P16D8 GMC?
- Repair tips may include replacing the sensor supply voltage relay, repairing any damaged wiring, and ensuring proper connection of the sensor.
6. Can I drive my vehicle with the OBDII code P16D8 GMC illuminated?
- It is not recommended to drive the vehicle with the code illuminated, as it may lead to further damage and worsen the performance of the vehicle.
7. How much does it typically cost to repair OBDII code P16D8 GMC?
- The cost of repair can vary depending on the underlying issue, but it may involve parts replacement and labor costs, ranging from $100 to $500 or more.
8. Will resetting the OBDII code P16D8 GMC resolve the issue?
- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying problem causing the code to trigger. Proper diagnosis and repair are necessary.
9. Can weather conditions affect the triggering of OBDII code P16D8 GMC?
- Extreme weather conditions can sometimes impact the electrical components involved, potentially leading to the triggering of the code. It's important to keep this in mind during diagnosis.
10. How often should I check for the OBDII code P16D8 GMC after it has been repaired?
- It is recommended to monitor the vehicle's performance and check for the code periodically to ensure that the issue has been successfully resolved.
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