P1596 — Automatic Transmission Diagnosis Input Signal Circuit High Input

What Does P1596 Mean?

P1596 is a manufacturer-specific diagnostic trouble code: Automatic Transmission Diagnosis Input Signal Circuit High Input. This code applies to SUBARU, DODGE, JEEP, PLYMOUTH, PONTIAC vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1596

⚠️ Check Engine Light (MIL) illuminated
⚠️ Automatic Transmission Diagnosis Input Signal reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Reduced engine performance

Common Causes

🔍 Short to voltage in Automatic Transmission Diagnosis Input Signal wiring harness
🔍 Corroded or water-damaged Automatic Transmission Diagnosis Input Signal connector
🔍 Faulty Automatic Transmission Diagnosis Input Signal outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P1596 mean?

P1596 indicates: Automatic Transmission Diagnosis Input Signal Circuit High Input. The vehicle's computer has detected that the Automatic Transmission Diagnosis Input Signal is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1596?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1596 for extended periods may cause additional problems.

How much does it cost to fix P1596?

Repair costs for P1596 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 Automatic Transmission Diagnosis Input Signal wiring for short to voltage
🔧 Clean or replace corroded Automatic Transmission Diagnosis Input Signal connector
🔧 Replace faulty Automatic Transmission Diagnosis Input Signal

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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.

P1596: Automatic Transmission Diagnosis Input Signal Circuit High Input