P0728

Engine Speed Input Circuit Intermittent

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Unstable tachometer readings
Problems with gear shifting (automatic transmission)
Engine failures
Check Engine Light Illuminates
Reduced engine power

Causes

Damage to the sensor wiring harness
Oxidation of contacts in connectors
Engine speed sensor malfunction
Mechanical damage to the gear
Circuit Grounding Problems

How to Fix

Check the integrity of the sensor wiring harness
Clean contacts in connectors
Check sensor resistance
Inspect the gear for damage
Replace sensor if necessary

Related codes

P0725 P0726 P0727