P2034 code meaning
Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 2)
Powertrain system Generic code P20xx codes Check engine light
What P2034 means
P2034 is the general electrical fault of the second exhaust temperature sensor on bank 2, so it only appears where the second bank has its own measuring point downstream. GM does not use it: the 2018 diesel tables number every exhaust temperature sensor on bank 1 (P0545/P0546, P2032/P2033, P242C/P242D, P2470/P2471), as one aftertreatment line serves the whole engine. Deutz assigns P2034 on its EMR L1 engine controller (industrial engines, list of November 2022) to the second temperature sensor upstream of the SCR catalyst, with failure-type bytes: -13 open, -11 shorted to ground, -12 shorted to battery, -F0 ground fault, -1C supply out of range. Others split low and high readings into P2035 and P2036. With the reading lost, temperature-dependent DEF dosing or filter regeneration is usually limited.
P2034 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2034
- Engine warning lamp on
- DEF dosing or particulate filter regeneration restricted
- Engine power reduced on some applications
Common causes of P2034
- Most likelySensor lead open or shorted where it runs along the hot exhaust
- PossibleSensing element failed after many heat cycles
- PossibleWater or corrosion in the sensor connector
- Less likelySensor ground or supply from the control unit faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust gas temperature sensorEgt harness
What each part of P2034 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 34 | The exact fault in that area. |
What to do next
- Note P2034 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2034
What does P2034 mean?
P2034 means "Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 2)". P2034 is the general electrical fault of the second exhaust temperature sensor on bank 2, so it only appears where the second bank has its own measuring point downstream. It is a generic code, so it means the same on every make.
Is it safe to drive with P2034?
Drive gently and only to a workshop. With P2034 the car can go into limp mode (reduced power) to protect itself.
Will P2034 fail an emissions test?
Yes, it can. P2034 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2034 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2034 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.