AutoCodes – GMC – P0694 GMC

P0694 GMC Code - Cooling Fan 2 Control Circuit High

Quick Answer

The Engine Control Module (ECM) grounds the low-speed relay, which is the Fan Low relay, and the high-speed relay, which is the Fan High relay, control circuits through an internal solid-state device called a driver. Common causes include Faulty Cooling Fan 2 Relay, Cooling Fan 2 Relay harness is open or shorted, Cooling Fan 2 Relay 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: P0694 GMC indicates Cooling Fan 2 Control Circuit High.
Common causes: Common causes include Faulty Cooling Fan 2 Relay, Cooling Fan 2 Relay harness is open or shorted, Cooling Fan 2 Relay 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.

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Code Popularity 749

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0694 GMC Description

The Engine Control Module (ECM) grounds the low-speed relay, which is the Fan Low relay, and the high-speed relay, which is the Fan High relay, control circuits through an internal solid-state device called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line that is monitored by the ECM. When the ECM is commanding a component ON, the voltage potential of the control circuit should be low, near 0 volts. When the ECM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be high, near battery voltage. If the ECM detects that the actual state of the control circuit does not match the expected state, a Diagnostic Trouble Code (DTC) will set.

OBDII Code P0694 GMC - Cooling Fan 2 Control Circuit High - AutoCodes.com — P0694 GMC Code - Cooling Fan 2 Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0694 GMC?

Faulty Cooling Fan 2 Relay
Cooling Fan 2 Relay harness is open or shorted
Cooling Fan 2 Relay circuit poor electrical connection
Faulty Cooling Fan 1
Faulty Engine Control Module (ECM)

How to Fix the DTC P0694 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 P0694 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 P0694 GMC code?

Need more information on how to fix the P0694 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0694 GMC code diagnosed by a professional: Find a repair shop in your area

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 P0694 GMC Code

1. What are the common symptoms of OBDII code P0694 GMC (Cooling Fan 2 Control Circuit High)?

- Common symptoms include the cooling fan running at high speeds constantly, engine overheating, and the Check Engine light illuminated on the dashboard.

2. What can cause the OBDII code P0694 GMC to trigger?

- The code P0694 GMC is typically triggered by a malfunction in the cooling fan 2 control circuit, such as a short circuit, damaged wiring, or a faulty cooling fan relay.

3. How serious is the OBDII code P0694 GMC?

- Ignoring the code P0694 GMC can lead to engine overheating, potential damage to engine components, and eventual engine failure. It is important to address this issue promptly.

4. How can I diagnose the cause of OBDII code P0694 GMC?

- To diagnose the cause of the code, you can use a scan tool to check for other related codes, test the cooling fan 2 relay, inspect the wiring for damage, and test the cooling fan motor.

5. Can I still drive my vehicle with the OBDII code P0694 GMC present?

- It is not recommended to drive your vehicle with the code P0694 GMC present, as it can lead to engine overheating and potential damage. It is best to address the issue before driving.

6. How can I repair the OBDII code P0694 GMC?

- Repairing the code typically involves fixing the underlying issue causing the high circuit in the cooling fan 2 control system, which may include repairing wiring, replacing the cooling fan relay, or fixing the cooling fan motor.

7. Can a DIY enthusiast fix the OBDII code P0694 GMC?

- Depending on your skill level and knowledge of automotive systems, a DIY enthusiast may be able to diagnose and repair the code P0694 GMC. However, it is recommended to have a professional technician perform the repairs for accurate diagnosis and proper fix.

8. What is the cost to repair OBDII code P0694 GMC at a mechanic?

- The cost to repair the code P0694 GMC at a mechanic can vary depending on the underlying issue, labor rates, and parts needed. It is recommended to get a diagnosis and estimate from a trusted mechanic.

9. Will resetting the Check Engine light resolve OBDII code P0694 GMC?

- Simply resetting the Check Engine light will not resolve the underlying issue causing the code P0694 GMC. It is important to diagnose and address the root cause of the problem to prevent further issues.

10. How can I prevent OBDII code P0694 GMC from occurring in the future?

- To prevent the code from occurring in the future, it is important to perform regular maintenance on your vehicle, inspect the cooling fan system for any signs of damage, and address any issues promptly to prevent overheating.