P1670 Cadillac Code - Quad Driver Module 'C' Fault Detected Conditions
Quick Answer
With the key on, the Powertrain Control Module (PCM) detects an open, short-to-ground or short-to-voltage on the QDM 'C' fault line (to the Air pump relay or Air pump solenoid), condition met for 20 seconds. Common causes include Faulty Quad Driver Module, Quad Driver Module harness is open or shorted, Quad Driver Module 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
- P1670 Cadillac indicates Quad Driver Module 'C' Fault Detected Conditions.
- Common causes
- Common causes include Faulty Quad Driver Module, Quad Driver Module harness is open or shorted, Quad Driver Module 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 P1670 Cadillac Description
What are the Possible Causes of the DTC P1670 Cadillac?
- Faulty Quad Driver Module
- Quad Driver Module harness is open or shorted
- Quad Driver Module circuit poor electrical connection
How to Fix the DTC P1670 Cadillac?
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 P1670 Cadillac 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 P1670 Cadillac Code
1. What does the OBDII code P1670 mean on a Cadillac?
P1670 indicates a fault in the Quad Driver Module (QDM) 'C', which is responsible for controlling certain electrical circuits in the vehicle.
2. What are the common symptoms of a P1670 code?
Common symptoms include the check engine light turning on, erratic engine performance, failure of specific electrical components, or issues with sensors and actuators.
3. What causes the P1670 code on a Cadillac?
The code can be caused by a short or open circuit in the wiring, a faulty Quad Driver Module, problematic sensors or actuators, or an issue with the vehicle's PCM (Powertrain Control Module).
4. Can I drive my Cadillac with a P1670 code?
Driving with a P1670 code may be possible, but it’s not recommended as it could lead to further damage or inconsistent vehicle performance, depending on which circuits are affected.
5. How is a P1670 code diagnosed?
Diagnosis typically involves using a scan tool to confirm the code, inspecting the wiring and connectors for damage, testing the affected circuits, and possibly checking the Quad Driver Module or PCM functionality.
6. What repairs are needed for a P1670 code?
Repairs may include replacing damaged wiring or connectors, repairing or replacing the affected sensor or actuator, or addressing a faulty Quad Driver Module or PCM.
7. How much does it cost to fix a P1670 code on a Cadillac?
The cost varies depending on the root cause. Repairs like fixing wiring or connectors may cost less, while replacing a PCM or Quad Driver Module could be more expensive, ranging from $100 to $1,000 or more.
8. Can a weak battery cause the P1670 code?
While unlikely, voltage issues from a weak or failing battery can sometimes cause electrical faults, so it’s worth testing the battery and charging system during diagnosis.
9. Is the P1670 code specific to Cadillac vehicles?
No, the P1670 code can appear on other GM vehicles as well, but the precise meaning and affected circuits may vary by model.
10. What tools are needed to troubleshoot a P1670 code?
A scan tool or OBDII code reader, a multimeter for checking electrical circuits, and the vehicle’s wiring diagram are essential for diagnosing this code.
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