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P1685 Pontiac Code - Transmission Control Module Power Up Temperature Sensor Circuit Low Voltage

Quick Answer

The P1685 diagnostic trouble code (DTC) for Pontiac vehicles indicates a problem with the Transmission Control Module (TCM) Power Up Temperature Sensor Circuit being detected as having low voltage. Common causes include Faulty Power Up Temperature Sensor, Wiring or connector issues in the sensor circuit, TCM 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
P1685 Pontiac indicates Transmission Control Module Power Up Temperature Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty Power Up Temperature Sensor, Wiring or connector issues in the sensor circuit, TCM 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1685 Pontiac Description

The P1685 diagnostic trouble code (DTC) for Pontiac vehicles indicates a problem with the Transmission Control Module (TCM) Power Up Temperature Sensor Circuit being detected as having low voltage. The TCM is a critical component of the vehicle's transmission system, responsible for controlling and managing the transmission's operation. The Power Up Temperature Sensor is designed to monitor the temperature of the transmission fluid and provide essential data to the TCM for optimal performance.

OBDII Code P1685 Pontiac - Transmission Control Module Power Up Temperature Sensor Circuit Low Voltage
P1685 Pontiac Code - Transmission Control Module Power Up Temperature Sensor Circuit Low Voltage

Common Causes of P1685 Pontiac

  1. Faulty Power Up Temperature Sensor
  2. Wiring or connector issues in the sensor circuit
  3. TCM malfunction
  4. Low transmission fluid level
  5. Electrical issues such as a blown fuse or short circuit

Symptoms of P1685 Pontiac

  1. Check Engine Light illuminated on the dashboard
  2. Transmission slipping or delayed shifting
  3. Rough or jerky shifting
  4. Decreased fuel efficiency
  5. Transmission overheating

How to Fix P1685 Pontiac

  1. Begin by using a diagnostic scanner to retrieve the trouble codes and confirm the presence of P1685.
  2. Inspect the Power Up Temperature Sensor and its circuit for any visible damage or corrosion. Replace the sensor if necessary.
  3. Check the wiring and connectors in the circuit for any breaks, abrasions, or loose connections. Repair or replace as needed.
  4. Test the TCM for proper functioning and potential faults. Replace the TCM if it is found to be malfunctioning.
  5. Clear the trouble codes from the vehicle's computer system and perform a test drive to ensure that the issue has been resolved.

Cost to Fix P1685 Pontiac

The cost of repairing a P1685 code for a Pontiac vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair can range from $50 to $200, depending on the components that need to be replaced. Labor costs can range from $100 to $300, based on the hourly rates of the repair shop and the time required to diagnose and fix the problem. It is advisable to consult with a qualified mechanic or repair shop to obtain a more accurate estimate based on the specific circumstances of your vehicle.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1685 Pontiac Code

1. What does the OBDII code P1685 indicate on a Pontiac?

Code P1685 on a Pontiac indicates a problem with the Transmission Control Module (TCM) Power Up Temperature Sensor Circuit, specifically that there is low voltage detected in the circuit.

2. What are common symptoms of code P1685 in a Pontiac?

Symptoms may include transmission shifting issues, the transmission entering limp mode, the check engine light turning on, and possibly the engine stalling or having difficulty starting.

3. What causes the P1685 code to appear on a Pontiac?

Potential causes include a faulty transmission control module, wiring issues like shorts or disconnections in the temperature sensor circuit, or a bad temperature sensor itself.

4. How can I diagnose the P1685 code in my Pontiac?

Diagnosis should start with a visual inspection of the TCM and associated wiring. Check for damaged wires, loose connections, and signs of corrosion. Use an OBDII scanner to check for additional codes that might provide further insight.

5. What steps are involved in repairing the P1685 code on a Pontiac?

Repair steps may include replacing the transmission temperature sensor, repairing or replacing damaged wiring or connectors, or in more severe cases, replacing the transmission control module.

6. Can I drive my Pontiac with the P1685 code active?

While you may be able to drive with this code active, it is not recommended as it can lead to further damage to the transmission system. It's best to address the issue promptly to avoid potential safety risks and more costly repairs later.

7. Is the P1685 code serious for the health of my Pontiac’s transmission?

Yes, this code is serious as it affects the transmission control module, which is crucial for proper transmission operation. Ignoring this code can lead to impaired driving performance and potential transmission failure.

8. What tools are needed to diagnose the P1685 code on a Pontiac?

Tools needed include an OBDII scanner, a multimeter for testing circuit voltages, and potentially a scan tool with advanced capabilities for deeper analysis of the transmission control module’s function.

9. How much does it typically cost to fix the P1685 code in a Pontiac?

Costs can vary widely depending on the specific repair needed. Simple wiring repairs might cost a few hundred dollars, while replacing the transmission control module could run over a thousand dollars, depending on the model and labor rates.

10. How can I prevent the P1685 code from recurring in my Pontiac?

Regular maintenance of your vehicle’s transmission and electrical systems is key. Ensure that wiring is checked during routine service to prevent issues related to poor connections or damaged wires.

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