What Codes Will This Page Cover?
On this page, you’ll learn more about the following diagnostic trouble codes:
- P0545 Exhaust Gas Temperature Sensor Circuit Low
- P0546 Exhaust Gas Temperature Sensor Circuit High
Who Has the Lowest Price?
Some service centers will give you an online estimate to compare. Why drive around Town!?
What Is the P0546 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
Get Additional Help
The P0545 and P0546 trouble code definitions are “Exhaust Gas Temperature Sensor Circuit Low” and “Exhaust Gas Temperature Sensor Circuit High,” respectively. In some cases, these fault codes may also indicate a specific bank and sensor, usually Bank 1 Sensor 1. These codes indicate that your powertrain control module (PCM) or engine control module (ECM) has detected an issue with the circuit running to your exhaust gas temperature sensor (EGT sensor), which you’ll find between the exhaust manifold and the catalytic converter. On diesel engines, it’s usually just before the diesel particulate filter (DPF). As a generic powertrain code, you may find these codes on various OBD-II-equipped vehicles.
More About the P0546 Code
When your vehicle burns the air/fuel ratio that it pumps into the engine to produce energy, it also creates exhaust gases. These fumes move from the engine through the exhaust system, which reduces the negative impact of these gases and pumps it out externally. It’s important that the exhaust system stays within a specific temperature range; high temperatures within the system can result in severe damage, including engine and turbocharger failure, so the engine needs to be able to monitor it. Codes P0545 and P0546 indicate that there’s a problem with the reference voltage signal for the circuit that allows the EGT sensor to send its information. If this 5-volt signal is off by a specific amount, you may see one of these codes.
What Are the Symptoms of a P0546 Code?
When the P0545 and P0546 codes initially show up, they’re most likely to just set an illuminated check engine light. It’s uncommon for these codes to initially do much more than set a malfunction indicator lamp on your dashboard. If you do notice any other symptoms, it’s most likely to be related to reduced engine performance. However, if the issue with your circuit develops into the circuit being actively unable to read your exhaust temperature, that could easily develop into more serious concerns, such as engine damage or turbocharger damage from excessive heat.
What Are Some Causes of a P0546 Code?
It’s most common for the P0545 and PD546 codes to have to do with an issue surrounding EGT sensor failure, including a dirty EGT sensor. Problems with wiring, including broken wires, missing insulation, and loose or corroded connectors, can also result in these codes. Suppose neither of these is the core problem. In that case, there may be an issue with the EGR valve, another component of the exhaust gas recirculation process, part of the vehicle emissions control concept. Sometimes, this problem has to do with fuel injector failure, although this often comes with additional codes. Other codes could also identify problems with other sensors, such as your oxygen sensors (O2 sensors). Very occasionally, it may have to do with PCM failure, but this is exceptionally uncommon.
How Serious Is the P0546 Code?
The P0545 and P0546 codes should definitely be considered quite serious. These error codes have to do with an important component in your vehicle; most of the EVAP system is less serious, but the EGT sensor refers to the temperature within your engine, which is then reflected in the temperature of your exhaust gases. Even though it’s unlikely to cause any drivability problems right now, this code can eventually turn into serious engine concerns. It’s best to fix this problem as soon as possible.
Can I Still Drive with a P0546 Code?
Most of the time, you’ll physically be able to drive with the P0545 and P0546 codes active. However, these error codes can fairly easily move into a more serious concern, concerns that can easily leave you stranded and needing to call for help. If you want to make sure that you’re safe when you drive, you should definitely avoid driving with this code active. Get help to fix the problem first.
How Easy Is It to Diagnose a P0546 Code?
Diagnosis for the P0545 and P0546 error codes can be difficult. The most common problem relating to these codes usually has to do with the EGT sensor itself or a component of the sensor wiring. However, if the problem is related to EGT sensor wiring, there are a lot of elements that could require a visual inspection to identify issues like corroded connectors and improper wiring components. Just finding a replacement sensor doesn’t always work. If you’re not well-versed in this process, diagnosing it can be hard, requiring lots of knowledge and access to diagnostic flow charts, and it’s best to leave it up to the experts.
How Difficult Is It to Inspect a P0546 Code?
The most difficult parts of inspection for the P0545 and P0546 codes usually have to do with inspecting the wiring. Wiring can be extremely complex to inspect, as you’ll likely need to have access to wiring diagrams and be able to spot potential issues with corroded and improperly connected wiring, which not all DIYers have the ability to do. It’s a good idea to get help from a professional in this context.
Need Additional Help with Your P0546 Code?
Many people end up needing additional help with the P0545 and P0546 codes; it’s an issue that many people can have a difficult time handling themselves. However, once you do seek help with these codes, you can rest assured that an expert will be able to fix the issue completely.
To start, you should find an auto repair shop in your area. Even though you can usually drive just fine with these codes active, it’s still best to find a local repair shop to fix your problem without having to go out of your way for it.
These codes can also come with other codes that may give you more insight into the core problems your vehicle is dealing with. The OBD-Il database at KBB.com can help you learn more about these issues and get an idea of what repairs may be necessary when you bring your vehicle in.
P0546 Q&A
Common Error Codes
Browse All OBD-II Codes
Get Recall Alerts
All recalls are considered serious. Stay safe. Take care of any recalls ASAP. The good news? Recall repairs are free when performed at a local dealer.