What Does P1175 Mean?
This code indicates the adaptive fuel trim (additive correction) for bank 2 has reached its malfunction threshold. Similar to P1174 but for the opposite cylinder bank, this means the PCM's ability to correct idle/low-load fuel delivery on bank 2 has been exceeded. The additive fuel trim correction has hit its calibrated limit, indicating a persistent air/fuel metering imbalance on bank 2 that requires mechanical repair.
Common Causes
30%
Vacuum leak on bank 2 intake manifold gasket or associated vacuum hoses
25%
Leaking or clogged fuel injector(s) on bank 2
20%
Exhaust leak upstream of the bank 2 O2 sensor skewing readings lean
15%
Faulty upstream oxygen sensor on bank 2 providing inaccurate feedback
10%
Intake manifold runner control issue affecting bank 2 airflow distribution
Diagnostic Steps
1
Record bank 2 additive and multiplicative fuel trim values at idle; compare to bank 1 values to confirm the issue is isolated to bank 2.
2
Perform a smoke test focused on bank 2 intake manifold gasket surfaces and all vacuum connections on that side of the engine.
3
Check for exhaust leaks at the bank 2 exhaust manifold and head pipe connections; even small leaks cause lean-biased O2 sensor readings.
4
Test bank 2 fuel injector balance by performing an injector contribution test with the scan tool; identify any cylinders with uneven contribution.
5
Verify bank 2 upstream O2 sensor response by performing a propane enrichment test; the sensor should respond promptly to the rich condition.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
This code indicates the adaptive fuel trim (additive correction) for bank 2 has reached its malfunction threshold. Similar to P1174 but for the opposite cylinder bank, this means the PCM's ability to correct idle/low-load fuel delivery on bank 2 has been exceeded. The additive fuel trim correction h...
The most common cause of P1175 (Fuel Trim Adaptation Additve Bank 2 Malfunction) is: Vacuum leak on bank 2 intake manifold gasket or associated vacuum hoses
Typical repair costs for P1175 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No immediate safety concern, but persistent metering issues can cause rough idle, stalling, and increased emissions. If both P1174 and P1175 are present simultaneously, a common cause affecting both banks should be investigated.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1175 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel / Air Metering
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
