Exhaust Gas Temperature Too High Bank 2
The P2429 code indicates that the Engine Control Module (ECM) has detected an exhaust gas temperature (EGT) reading above the maximum threshold for Bank 2 (the side of the engine not containing cylinder #1). This is typically caused by a faulty EGT sensor, a restricted exhaust system (e.g., clogged catalytic converter or DPF), or an engine running too rich/lean. High exhaust temperatures can damage catalytic converters and other components.
1. Most Common Causes
- Excessively rich or lean fuel mixture altering combustion and exhaust temperatures
- Engine misfires sending unburned hydrocarbons into the catalyst, causing secondary combustion
- Air leaks in the intake manifold or exhaust piping before the catalyst, leading to secondary combustion
- Faulty or out-of-range exhaust gas temperature (EGT) sensor
- Restricted exhaust system (clogged catalytic converter or collapsed muffler) increasing backpressure and temperature
- Faulty fuel injectors (stuck open or leaking internally)
- Inefficient engine cooling system or general engine overheating
- Inoperative or insufficient EGR valve flow (if applicable), raising combustion temperatures
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Increased fuel consumption
- Possible overheating under the hood
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect EGT sensor wiring and connector for damage.
Step 3: Compare EGT sensor readings with a scan tool; check for erratic or out-of-range values.
Step 4: Test exhaust backpressure to check for restricted catalytic converter or DPF.
Step 5: Check fuel trims and oxygen sensor readings for rich/lean condition.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code as high exhaust temperatures can damage the catalytic converter and other components. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost varies depending on the cause. Replacing an EGT sensor typically costs $150-$300 including labor. If the catalytic converter or DPF needs replacement, costs can exceed $1000.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.