P28E8 — Shift Motor Position Sensor Circuit High

What Does P28E8 Mean?

P28E8 is a diagnostic trouble code indicating: Shift Motor Position Sensor 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 P28E8

⚠️ Check Engine Light (MIL) illuminated
⚠️ Shift Motor Position Sensor reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Reduced engine performance

Common Causes

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

Frequently Asked Questions

What does P28E8 mean?

P28E8 indicates: Shift Motor Position Sensor Circuit High. The vehicle's computer has detected that the Shift Motor Position Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P28E8?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P28E8 for extended periods may cause additional problems.

How much does it cost to fix P28E8?

Repair costs for P28E8 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 Shift Motor Position Sensor wiring for short to voltage
🔧 Clean or replace corroded Shift Motor Position Sensor connector
🔧 Replace faulty Shift Motor Position 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.

P28E8: Shift Motor Position Sensor Circuit High