What are the common causes of P26BE?

A short to ground on the engine coolant bypass valve D control circuit. Low voltage feeding the engine coolant bypass valve D control circuit. A failed engine coolant bypass valve D. High resistance in the engine coolant bypass valve D control wiring.

Read engine coolant bypass valve D status on a scan tool. Measure voltage on the engine coolant bypass valve D control circuit. Check the engine coolant bypass valve D control circuit for a short to ground. Inspect the engine coolant bypass valve D connector and wiring. Replace engine coolant bypass valve D if the circuit tests good. Clear the code and retest.

P26BE

Engine Coolant Bypass Valve D Control Circuit Low

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P26BE means Engine Coolant Bypass Valve D Control Circuit Low.

Where it lives

For P26BE, the description names the valve as the part involved.

Check these first

A short to ground on the engine coolant bypass valve D control circuit
Low voltage feeding the engine coolant bypass valve D control circuit
A failed engine coolant bypass valve D
High resistance in the engine coolant bypass valve D control wiring

What to do next

Read engine coolant bypass valve D status on a scan tool
Measure voltage on the engine coolant bypass valve D control circuit
Check the engine coolant bypass valve D control circuit for a short to ground
Inspect the engine coolant bypass valve D connector and wiring
Replace engine coolant bypass valve D if the circuit tests good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.