P1126
Thermostat Function
2007-2012 Nissan Altima 2.5L I4
Moderate SeverityPowertrain
Description
Engine coolant temperature not reaching expected operating temperature.
Symptoms
- CEL
- Engine runs cold
- Poor efficiency
- Weak heater
- Slow warm-up
Common Causes
- Thermostat stuck open
- Faulty ECT sensor
- Air in cooling system
- Low coolant
Diagnostic Steps
- Monitor coolant temp
- Test thermostat
- Check ECT sensor
- Inspect cooling system
Repair Notes
Replace thermostat.
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1126 on Other Vehicles
Nissan 200SX
1995-1998 1.6L I4 GA16DE
Nissan 200SX SE-R
1995-1998 2.0L I4 SR20DE
Nissan 240SX
1995-1998 2.4L I4 KA24DE
Nissan 300ZX
1990-1996 3.0L V6 VG30DE
Nissan 300ZX Twin Turbo
1990-1996 3.0L Twin-Turbo V6 VG30DETT
Nissan 350Z
2003-2006 3.5L V6 VQ35DE
Nissan 350Z
2007-2009 3.5L V6 VQ35HR
Nissan 370Z
2009-2020 3.7L V6 VQ37VHR
Common Questions
What does code P1126 mean on a 2007-2012 Nissan Altima?
P1126 stands for "Thermostat Function". Engine coolant temperature not reaching expected operating temperature.
What are the symptoms of P1126 on a Nissan Altima?
Common symptoms of P1126 include: CEL, Engine runs cold, Poor efficiency, Weak heater, Slow warm-up.
What causes P1126 on a 2007-2012 Nissan Altima?
Common causes of P1126 include: Thermostat stuck open, Faulty ECT sensor, Air in cooling system, Low coolant.