AutoCodes – Generic – P26A6

P26A6 Code - Engine Coolant Bypass Valve Position Sensor Circuit Low Voltage

Quick Answer

The passenger compartment heater coolant control valve regulates the engine coolant flow into the cabin heater loop depending on engine coolant temperature and ambient temperature conditions. Common causes include Faulty Engine Engine Coolant Bypass Valve Position Sensor, Engine Coolant Bypass Valve Position Sensor harness is open or shorted, Engine Coolant Bypass Valve Position Sensor 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: P26A6 indicates Engine Coolant Bypass Valve Position Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Engine Engine Coolant Bypass Valve Position Sensor, Engine Coolant Bypass Valve Position Sensor harness is open or shorted, Engine Coolant Bypass Valve Position Sensor 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 20,033

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 Jan 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P26A6 Description

The passenger compartment heater coolant control valve regulates the engine coolant flow into the cabin heater loop depending on engine coolant temperature and ambient temperature conditions. The passenger compartment heater coolant control valve has two positions: ByPass or Link. In the ByPass position, the coolant in the engine loop and heater loop are separated and in the link position the coolant circulates through both loops. The valve movement is controlled by a PWM signal. A 50% duty cycle is a normal duty cycle. A 75% duty cycle represents a valve commanded to the link position. A 25% duty cycle represents a valve commanded to the ByPass position. The passenger compartment heater coolant control valve uses an internal position sensor that sends a signal to the hybrid powertrain control module to determine the valve position.
When the engine coolant temperature heats up, a valve learn procedure takes place. The hybrid powertrain control module 2 commands the valve to the link position and records the voltage coming back from the position sensor. Then the hybrid powertrain control module 2 commands the valve back to the bypass position and records the voltage coming back from the position sensor. The voltage values in both the link and bypass positions must fall within calibrated ranges.

OBDII Code P26A6 - Engine Coolant Bypass Valve Position Sensor Circuit Low Voltage - AutoCodes.com — P26A6 Code - Engine Coolant Bypass Valve Position Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P26A6?

Faulty Engine Engine Coolant Bypass Valve Position Sensor
Engine Coolant Bypass Valve Position Sensor harness is open or shorted
Engine Coolant Bypass Valve Position Sensor circuit poor electrical connection

How to Fix the DTC P26A6?

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 P26A6 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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Information for Specific Makes

P26A6 Buick — Engine Coolant Bypass Valve Position Sensor Circuit Low Voltage
P26A6 Cadillac — Engine Coolant Bypass Valve Position Sensor Circuit Low Voltage
P26A6 Chevrolet — Engine Coolant Bypass Valve Position Sensor Circuit Low Voltage
P26A6 Dodge — Engine Coolant Bypass Valve Position Sensor Circuit Low
P26A6 GMC — Engine Coolant Bypass Valve Position Sensor Circuit Low Voltage

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 P26A6 Code

1. What are common symptoms of OBDII code P26A6 (Engine Coolant Bypass Valve Position Sensor Circuit Low Voltage)?

The common symptoms include engine overheating, poor heater performance, and a check engine light illuminated on the dashboard.

2. What are possible causes of OBDII code P26A6?

Possible causes of this code can include a faulty coolant bypass valve, a malfunctioning position sensor, damaged wiring or connectors in the circuit, or low coolant levels.

3. How can I diagnose the issue related to OBDII code P26A6?

You can diagnose the issue by using a diagnostic scanner to read the code, checking the coolant bypass valve and its sensor for proper functioning, and inspecting the wiring and connectors for any damage.

4. Can I still drive my vehicle with OBDII code P26A6 present?

It is not recommended to drive the vehicle with this code present, as it can lead to engine overheating and potential damage. It is best to address the issue promptly.

5. How can I repair OBDII code P26A6?

Repairing this code may involve replacing the faulty coolant bypass valve, position sensor, or repairing any damaged wiring or connectors in the circuit. It is recommended to follow manufacturer's guidelines for proper repair.

6. Is it safe to reset the OBDII code P26A6 and continue driving without addressing the issue?

Resetting the code without addressing the underlying issue is not recommended, as it can lead to further problems and potential engine damage. It is best to diagnose and repair the root cause of the code.

7. Can a DIY enthusiast fix OBDII code P26A6 at home?

Depending on your skill level and access to tools, a DIY enthusiast may be able to address this code at home by following repair guides and being cautious with electrical components. However, professional help is recommended for complex issues.

8. How much does it typically cost to repair OBDII code P26A6 at a mechanic or dealership?

The cost of repairing this code can vary depending on the exact cause of the issue, parts needed, and labor costs. It is advisable to get estimates from different mechanics or dealerships before proceeding with the repair.

9. What are the long-term effects of ignoring OBDII code P26A6?

Ignoring this code can lead to engine overheating, potential damage to engine components, and decreased vehicle performance. It is crucial to address the issue promptly to prevent further complications.

10. Can weather conditions or driving habits contribute to triggering OBDII code P26A6?

Extreme weather conditions, frequent stop-and-go driving, or driving with low coolant levels can contribute to triggering this code. It is essential to maintain proper vehicle maintenance and drive cautiously to prevent such issues.