AutoCodes – Buick – P135C Buick

P135C Buick Code - Cooling Fan 1 Status Signals Message Counter Incorrect

Quick Answer

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Cooling Fan 1, Cooling Fan 1 harness is open or shorted, Cooling Fan 1 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: P135C Buick indicates Cooling Fan 1 Status Signals Message Counter Incorrect.
Common causes: Common causes include Faulty Cooling Fan 1, Cooling Fan 1 harness is open or shorted, Cooling Fan 1 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 643

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 Sep 27, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P135C Buick Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Cooling Fan 1 Status Signals Message Counter is Incorrect.

OBDII Code P135C Buick - Cooling Fan 1 Status Signals Message Counter Incorrect - AutoCodes.com — P135C Buick Code - Cooling Fan 1 Status Signals Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P135C Buick?

Faulty Cooling Fan 1
Cooling Fan 1 harness is open or shorted
Cooling Fan 1 circuit poor electrical connection

How to Fix the DTC P135C Buick?

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 P135C Buick 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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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 P135C Buick Code

1. What does the OBDII code P135C mean on a Buick?

Code P135C indicates an issue with the Cooling Fan 1 status signals, specifically that the message counter from the fan module is incorrect or invalid.

2. What are common symptoms of code P135C in a Buick?

Symptoms may include engine overheating, cooling fan not operating properly, the check engine light illuminated, or irregular fan speed.

3. What causes the P135C code to appear?

Possible causes include a faulty cooling fan module, damaged wiring or connectors in the cooling fan circuit, or a communication issue between the fan module and the ECM.

4. Can I drive my Buick with the P135C code active?

It is not recommended to drive for extended periods as the cooling fan may not function properly, leading to potential engine overheating and damage.

5. How is the P135C code diagnosed?

A mechanic will inspect the cooling fan wiring and connectors, test the cooling fan module, and use a scan tool to check for communication errors between the fan module and the ECM.

6. How can I fix code P135C on my Buick?

Repairs may include replacing the cooling fan module, repairing damaged wiring or connectors, or reprogramming the ECM if necessary.

7. Is the P135C code specific to certain Buick models?

While it can appear on various Buick models, the code is typically related to new-generation vehicles with advanced cooling fan control systems.

8. How much does it cost to repair the P135C code on a Buick?

Repair costs can vary but typically range from $150 to $500, depending on whether the cooling fan module or wiring needs replacement.

9. Can a weak battery cause the P135C code?

Yes, a weak or failing battery can potentially cause communication errors between the ECM and the cooling fan module, triggering this code.

10. Will clearing the P135C code fix the issue?

Simply clearing the code without addressing the root cause will not fix the problem and may result in the code returning. Proper diagnosis and repair are necessary.