P1597 — Speed Control Switch Always Low

What Does P1597 Mean?

P1597 is a manufacturer-specific diagnostic trouble code: Speed Control Switch Always Low. This code applies to 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 P1597

⚠️ Check Engine Light (MIL) illuminated
⚠️ Speed Control Switch Always Low not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty Speed Control Switch Always Low
🔍 Wiring or connector issue in Speed Control Switch Always Low circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P1597 mean?

P1597 indicates: Speed Control Switch Always Low. The vehicle's computer has detected that the Speed Control Switch Always Low is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1597?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1597 for extended periods may cause additional problems.

How much does it cost to fix P1597?

Repair costs for P1597 typically range from $80 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 Speed Control Switch Always Low and related wiring
🔧 Replace faulty Speed Control Switch Always Low

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.

P1597: Speed Control Switch Always Low