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OBD Code P1199

Radiator Temperature Sensor Voltage Too Low (Dodge)

CodeP1199
DescriptionRadiator Temperature Sensor Voltage Too Low (Dodge)
SystemFuel System

What Does P1199 Mean?

Radiator Temperature Sensor Voltage Too Low (Dodge). This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the fuel system.

Code Breakdown

P = Powertrain code

1 = Manufacturer-specific

How to Fix P1199

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check coolant level in the reservoir and radiator (when cold). Top off if low.
  2. Inspect for coolant leaks at hoses, water pump, radiator, and heater core connections.
  3. Test the thermostat — if the engine takes too long to warm up or overheats, replace it.
  4. Check the coolant temperature sensor connector and wiring. Test sensor resistance at known temperatures.
  5. Verify the cooling fan operates when the engine reaches operating temperature.
  6. Flush the cooling system if the coolant is old, discolored, or contaminated.
  7. Clear codes and monitor coolant temperature during a test drive.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P1199 serious?

Yes — P1199 is considered a high-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear P1199 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P1199?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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