P077D — Output Shaft Speed Sensor Circuit High

What Does P077D Mean?

P077D is a diagnostic trouble code indicating: Output Shaft Speed Sensor Circuit High. This code relates to the transmission system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P077D

⚠️ Check Engine Light (MIL) illuminated
⚠️ Output Shaft Speed Sensor reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Harsh or delayed shifting

Common Causes

🔍 Short to voltage in Output Shaft Speed Sensor wiring harness
🔍 Corroded or water-damaged Output Shaft Speed Sensor connector
🔍 Faulty Output Shaft Speed Sensor outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P077D mean?

P077D indicates: Output Shaft Speed Sensor Circuit High. The vehicle's computer has detected that the Output Shaft Speed Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P077D?

Only short distances if absolutely necessary. P077D affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P077D?

Repair costs for P077D typically range from $20 to $500, 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 Output Shaft Speed Sensor wiring for short to voltage
🔧 Clean or replace corroded Output Shaft Speed Sensor connector
🔧 Replace faulty Output Shaft Speed Sensor

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.

P077D: Output Shaft Speed Sensor Circuit High