P1388 — Auto Shutdown (ASD) Relay Control Circuit Open Or Shorted

What Does P1388 Mean?

P1388 is a manufacturer-specific diagnostic trouble code: Auto Shutdown (ASD) Relay Control Circuit Open Or Shorted. This code applies to DODGE, JEEP, PLYMOUTH, PONTIAC, OTHER 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 P1388

⚠️ Check Engine Light (MIL) illuminated
⚠️ No signal from Auto Shutdown (ASD) Relay
⚠️ Related system defaulting to backup values
⚠️ Reduced engine performance

Common Causes

🔍 Broken wire in Auto Shutdown (ASD) Relay circuit
🔍 Disconnected Auto Shutdown (ASD) Relay electrical connector
🔍 Auto Shutdown (ASD) Relay internal open circuit failure
🔍 Corroded terminal pins preventing electrical contact

Frequently Asked Questions

What does P1388 mean?

P1388 indicates: Auto Shutdown (ASD) Relay Control Circuit Open Or Shorted. The vehicle's computer has detected that the Auto Shutdown (ASD) Relay is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1388?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1388 for extended periods may cause additional problems.

How much does it cost to fix P1388?

Repair costs for P1388 typically range from $30 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

🔧 Locate and repair broken wire in Auto Shutdown (ASD) Relay circuit
🔧 Replace damaged Auto Shutdown (ASD) Relay connector
🔧 Replace Auto Shutdown (ASD) Relay if internally open

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.

P1388: Auto Shutdown (ASD) Relay Control Circuit Open Or Shorted