P1623 GMC Code - Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions
Quick Answer
With the cold engine startup completed, engine running, the Powertrain Control Module (PCM) detects a fault in the PCM pull-up resistor used to revise Engine Coolant Temperature (ECT) resolution throughout the complete engine operating range. Common causes include Faulty Transmission Fluid Temperature (TFT), Transmission Fluid Temperature (TFT) harness is open or shorted, Transmission Fluid Temperature (TFT) 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
- P1623 GMC indicates Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions.
- Common causes
- Common causes include Faulty Transmission Fluid Temperature (TFT), Transmission Fluid Temperature (TFT) harness is open or shorted, Transmission Fluid Temperature (TFT) 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 P1623 GMC Description
What are the Possible Causes of the DTC P1623 GMC?
- Faulty Transmission Fluid Temperature (TFT)
- Transmission Fluid Temperature (TFT) harness is open or shorted
- Transmission Fluid Temperature (TFT) circuit poor electrical connection
How to Fix the DTC P1623 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 P1623 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.
Need more information about the P1623 GMC code?
Need more information on how to fix the P1623 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1623 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1623 GMC Code
No Frequently Asked Questions about P1623 GMC Code found.
Discuss the causes and fixes for P1623 GMC OBDII Code
Code P1623 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.
