P26D5 — Engine Coolant Pump Supply Voltage Circuit High

What Does P26D5 Mean?

P26D5 is a diagnostic trouble code indicating: Engine Coolant Pump Supply Voltage Circuit High. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P26D5

⚠️ Check Engine Light (MIL) illuminated
⚠️ Engine Coolant Pump Supply Voltage reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Reduced engine performance

Common Causes

🔍 Short to voltage in Engine Coolant Pump Supply Voltage wiring harness
🔍 Corroded or water-damaged Engine Coolant Pump Supply Voltage connector
🔍 Faulty Engine Coolant Pump Supply Voltage outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P26D5 mean?

P26D5 indicates: Engine Coolant Pump Supply Voltage Circuit High. The vehicle's computer has detected that the Engine Coolant Pump Supply Voltage is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P26D5?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P26D5 for extended periods may cause additional problems.

How much does it cost to fix P26D5?

Repair costs for P26D5 typically range from $20 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Engine Coolant Pump Supply Voltage wiring for short to voltage
🔧 Clean or replace corroded Engine Coolant Pump Supply Voltage connector
🔧 Replace faulty Engine Coolant Pump Supply Voltage

1
Find your vehicle above
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P26D5: Engine Coolant Pump Supply Voltage Circuit High