P1674 GMC Code - Tachometer Control Circuit
Quick Answer
The P1674 diagnostic trouble code (DTC) for GMC vehicles relates to the tachometer control circuit. Common causes include Faulty tachometer sensor, Damaged wiring or connectors in the tachometer circuit, ECM malfunction. 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
- P1674 GMC indicates Tachometer Control Circuit.
- Common causes
- Common causes include Faulty tachometer sensor, Damaged wiring or connectors in the tachometer circuit, ECM malfunction.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1674 GMC Description
The P1674 diagnostic trouble code (DTC) for GMC vehicles relates to the tachometer control circuit. This code is triggered when the Engine Control Module (ECM) detects a problem with the tachometer signal circuit. The tachometer is responsible for displaying the engine's RPM (Revolutions Per Minute) on the instrument cluster. When this circuit malfunctions, it can lead to inaccuracies in RPM readings or a complete failure of the tachometer display.
Common Causes of P1674 GMC
- Faulty tachometer sensor
- Damaged wiring or connectors in the tachometer circuit
- ECM malfunction
- Poor electrical connection
- Engine speed sensor issues
Symptoms of P1674 GMC
- Inaccurate or erratic tachometer readings
- Tachometer needle fluctuating unexpectedly
- Tachometer not working at all
- Engine misfires or hesitation
- Check Engine Light illuminated
How to Fix P1674 GMC
- Diagnose the tachometer control circuit using a scan tool to pinpoint the exact cause of the issue.
- Inspect the wiring and connectors for any damage or corrosion. Repair or replace as necessary.
- Test the tachometer sensor for proper functionality. Replace if faulty.
- Check the ECM for any signs of malfunction. Reset or replace if needed.
- Clear the DTC and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P1674 GMC
The typical repair costs for addressing the P1674 code related to the tachometer control circuit can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the parts for this repair could range from $50 to $200, while the labor costs may add another $100 to $200 to the total bill. Keep in mind that diagnosis time and labor rates at auto repair shops can fluctuate, so it's advisable to inquire about local rates for a more accurate estimate.
Need more information about the P1674 GMC code?
Need more information on how to fix the P1674 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1674 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1674 GMC Code
No Frequently Asked Questions about P1674 GMC Code found.
Discuss the causes and fixes for P1674 GMC OBDII Code
Code P1674 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.