P1628 Code - Powertrain Control Module Engine Control Temperature Pullup Resistor Conditions
Quick Answer
With the cold engine startup, the Powertrain Control Module (PCM) detects a fault in the PCM pullup resistor used to revise Engine Control Temperature (ECT) resolution in engine operation. Common causes include Faulty Engine Control Temperature Pullup Resistor, Engine Control Temperature Pullup Resistor harness is open or shorted, Engine Control Temperature Pullup Resistor 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
- P1628 indicates Powertrain Control Module Engine Control Temperature Pullup Resistor Conditions.
- Common causes
- Common causes include Faulty Engine Control Temperature Pullup Resistor, Engine Control Temperature Pullup Resistor harness is open or shorted, Engine Control Temperature Pullup Resistor 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 P1628 Description
What are the Possible Causes of the DTC P1628?
- Faulty Engine Control Temperature Pullup Resistor
- Engine Control Temperature Pullup Resistor harness is open or shorted
- Engine Control Temperature Pullup Resistor circuit poor electrical connection
How to Fix the DTC P1628?
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 P1628 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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Need Help with the Code?
Get the P1628 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P1628 Buick — Powertrain Control Module Engine Control Temperature Pullup Resistor Conditions
- P1628 Cadillac — Powertrain Control Module Engine Control Temperature Pullup Resistor Conditions
- P1628 Chevrolet — Powertrain Control Module Engine Control Temperature Pullup Resistor Conditions
- P1628 Dodge — Sensor Reference Voltage 2 Circuit Erratic
- P1628 GMC — Powertrain Control Module Engine Control Temperature Pullup Resistor Conditions
- P1628 Hyundai — Condenser Fan Circuit Low
- P1628 Mazda — ECM to ABS/TCS Communication Signal Error
- P1628 RAM — Sensor Reference Voltage 2 Circuit Erratic
- P1628 Saab — Battery Voltage Too Low / High
Frequently Asked Questions about P1628 Code
1. What are the common symptoms of OBDII code P1628?
The common symptoms of code P1628 may include engine overheating, poor engine performance, and possible illumination of the check engine light.
2. What are the possible causes of OBDII code P1628?
Possible causes of code P1628 include a faulty engine control module (ECM), issues with the engine coolant temperature sensor, or problems with the wiring or connectors related to the ECM.
3. How do I diagnose OBDII code P1628?
Diagnosing code P1628 typically involves using a scan tool to retrieve the code, checking the engine coolant temperature sensor, inspecting the wiring and connectors, and testing the ECM for proper functioning.
4. Can I continue driving with OBDII code P1628 present?
It is not recommended to continue driving with code P1628 present, as it can lead to engine overheating and potential damage. It is best to address the issue promptly to prevent further problems.
5. How can I repair OBDII code P1628?
Repairing code P1628 may involve replacing the faulty engine control module, replacing the engine coolant temperature sensor, or repairing any wiring or connector issues. It is recommended to consult a professional mechanic for proper diagnosis and repair.
6. Will resetting the ECM clear OBDII code P1628?
Resetting the ECM may temporarily clear the code, but if the underlying issue causing code P1628 is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the code for a permanent solution.
7. How much does it typically cost to repair OBDII code P1628?
The cost of repairing code P1628 can vary depending on the specific cause of the issue, the labor rates in your area, and the cost of parts. It is advisable to obtain quotes from different mechanics or repair shops for an accurate estimate.
8. Can a DIY enthusiast fix OBDII code P1628?
While some DIY enthusiasts may have the skills to diagnose and repair code P1628, it is a complex issue that may require specialized tools and knowledge. If you are not experienced in automotive repair, it is best to seek assistance from a professional mechanic.
9. What other codes may be related to OBDII code P1628?
Codes related to engine control module (ECM) malfunctions, engine coolant temperature sensor issues, or wiring problems may be related to OBDII code P1628. It is recommended to address any related codes during diagnosis and repairs.
10. How urgent is it to address OBDII code P1628?
It is important to address code P1628 promptly to prevent potential engine damage or overheating. Ignoring the issue can lead to more severe problems and costly repairs in the long run.
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