WagonRFix

P0115 on Suzuki Wagon R: Engine Coolant Temperature Sensor Circuit Malfunction

Short answer: P0115 means “Engine Coolant Temperature Sensor Circuit Malfunction”. The car’s computer has found a fault in the Engine system and turns on the Check engine light (MIL). First check: read the code and freeze-frame data with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code
P0115
System
Engine
Dashboard light
Check engine light (MIL)
Also sold as
Maruti Suzuki Wagon R, Suzuki Karimun Wagon R (Indonesia)
Applies to
Generic OBD-II meaning. Not every code is used by this car.
Confidence
medium (generic OBD-II definition, not checked against the factory manual for this car)
Source
obd-codes.com

Symptoms and when it is set

  1. Check engine light on
  2. Vehicle may be hard to start
  3. May blow a lot of black smoke and run extremely rich
  4. Engine may want to die or backfire in tailpipe
  5. Engine may run lean and increased Nox emissions may be apparent (Requires gas analyzer)
  6. Cooling fans may run all the time when they shouldn't be, or not at all when they should be

Likely causes

  1. Usually the cause can be traced to a bad
  2. ECT sensor
  3. Wiring or connector damaged at sensor
  4. Open or short in reference or signal circuit
  5. Open or short in signal circuit
  6. Bad PCM

What to check, in order

  1. Read the code and freeze-frame data with an OBD-II scanner
  2. Check the connector and wiring of the part named in the code
  3. Test the part with scanner live data or a multimeter, using the values in the repair manual
  4. Fix the cause, clear the code and test-drive

Related on this car

Same code on other cars

← P0113 P0116 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.