Engine-Codes.com | All About OBDII Engine Codes
Engine-Codes.com | All About OBDII Engine Codes

P0155 Chevrolet

P0155 Chevrolet - HO2S Heater Performance Bank 2 Sensor 1

PDF
P0155 Chevrolet Comments |  Add Comment
Possible causes
- Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
Help with Possible causes What does this mean?
Tech notes
The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the Front Heated Oxygen Sensor (H2OS) Bank 2 usually takes care of the problem.
Help with Tech Notes What does this mean?
When is the code detected?
The Powertrain Control Module (PCM) runs the heater test only on a cold start (depends on the cumulative air flow) and only once an ignition cycle. When you start the engine the PCM monitors the HO2S voltage. When the HO2S voltage goes above or below the bias range threshold, the PCM determines how much time it took. If the PCM detects that the process took too much time for the HO2S to enter into normal operating range, the P0155 code will set. The time the process takes the HO2S to reach operating temperature is based on the amount of air that flows into the engine.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible higher fuel consumption
- Possible more smoke from exhaust than usual
P0155 Chevrolet Description

The Powertrain Control Module (PCM) supplies a bias voltage (approximately 450 mV) on the Heated Oxygen Sensor (HO2S) signal high and low circuits. When you turn the ignition to the ON position, battery voltage is supplied to the HO2S heater. As the heater reaches the operating temperature, the HO2S voltage responds by changing from a bias voltage range to the normal operation. Typically, as the HO2S reaches the operating temperature, the HO2S voltage goes from a bias voltage to a voltage below 300 mV. Depending on the exhaust gas content, it is possible for the HO2S voltage to go above 450 mV.

Need more help?
Do you need more help with the P0155 Chevrolet code? ask a question to our users or search the top hand picked automotive forums for more information


(You will add more details to the question in the next step)
or
CHEVROLET Technical Service Bulletins for P0155 code
2001 CHEVROLET EXPRESS Engine And Engine Cooling:engine Details
2004 CHEVROLET SILVERADO Engine And Engine Cooling:engine Details
2004 CHEVROLET SUBURBAN Engine And Engine Cooling:engine Details
2004 CHEVROLET TAHOE Engine And Engine Cooling:engine Details
2001 CHEVROLET EXPRESS 061000 Engine And Engine Cooling:engine Details
More Bulletins Help with Technical Service Bulletins What does this mean?
Repair Shops Around Your Area
See More...
Need parts?
Need parts to fix this code? Search hundreds of stores at the same time and compare prices


Help Engine-Codes.com
Help us improve Engine-Codes.com. Leave a comment below or tell us if the information above help you fix the code. What are symptoms is your vehicle for the P0155 Chevrolet code? Have you replaced any parts?
Any information is appreciated. Thanks
Engine-Codes.com Comments Powered by Disqus
Google +
Engine Light ON?

The Engine-Codes.com ELM327 WiFi Car Diagnostic connects to your Android phone, iPhone, iPad, or Windows computer from your vehicle.
Ask OBDII Question