Limp mode
Thread Starter
Joined: Mar 2025
Posts: 6
From: Southern Ohio
Limp mode
I have a 04 Accord EX and a couple of days ago I replaced the top transmission mount and positive battery terminal and the next day my car went into limp mode. The day before I did said work, car drove great.
Scanned and found 3 codes two being o2 sensors because I need to replace a broken wire. And p0717 input shaft speed sensor, replaced old sensor with new replacement part, and car is still going into limp mode.
Also changed battery terminal on both pos and neg to better conducting terminals and checked transmission fluid levels "within limits"
Note: car has always had codes for o2 sensors since I bought it from a friend.
This is my daily and really need to figure this out ASAP!!!
Any help would be great!!!!
Thanks!
Scanned and found 3 codes two being o2 sensors because I need to replace a broken wire. And p0717 input shaft speed sensor, replaced old sensor with new replacement part, and car is still going into limp mode.
Also changed battery terminal on both pos and neg to better conducting terminals and checked transmission fluid levels "within limits"
Note: car has always had codes for o2 sensors since I bought it from a friend.
This is my daily and really need to figure this out ASAP!!!
Any help would be great!!!!
Thanks!
Thread Starter
Joined: Mar 2025
Posts: 6
From: Southern Ohio
Not that I am aware of,
I did test the signal wire for continuity from the plug to where all the harnesses connect to the main harness that goes into the firewall. I did get continuity, but while I was doing the test I could hear something like a electric valve being activated.
After replacing the input speed sensor I now have an extra couple of engine codes now. Along with the same code for the input speed sensor code of P0717.
Newest code is P2649.
I did test the signal wire for continuity from the plug to where all the harnesses connect to the main harness that goes into the firewall. I did get continuity, but while I was doing the test I could hear something like a electric valve being activated.
After replacing the input speed sensor I now have an extra couple of engine codes now. Along with the same code for the input speed sensor code of P0717.
Newest code is P2649.
Super Moderator
Joined: Sep 2006
Posts: 16,331
From: Houston, TX
It might be helpful to post all the codes you are getting to see if they are related. The two you posted don't seem related.
You might want to stop by a parts store and have them test the battery and alternator to see if abnormal voltage is messing up the system.
You might want to stop by a parts store and have them test the battery and alternator to see if abnormal voltage is messing up the system.
Thread Starter
Joined: Mar 2025
Posts: 6
From: Southern Ohio
P0155
P0135
P0154
P0141
Newest codes: after replacing top transmission mount
P0717
P2649
Super Moderator
Joined: Sep 2006
Posts: 16,331
From: Houston, TX
Based on your codes, is this a V6 engine?
The P0155, P0135, P0154, and P0141 are all for the heater circuits in 3 of the 4 O2 sensors.
P0717 is for the input/mainshaft speed sensor/circuit on the transmission.
P2649 is for the vtec solenoid high voltage.
The original four likely have nothing to do with the existing codes, but should be fixed. You mentioned a bad wire. Try to find the location of the damage, because it is possible other wires are damaged and causing the two new codes.
The codes don't necessarily mean to replace a sensor as something upstream like the wiring could be damaged. Since you have a scanner, look at the values and/or voltage the PCM is reporting from the sensors. This can help give you some direction. Testing for power and ground to the vtec and mainshaft sensor may help narrow down the issue.
The P0155, P0135, P0154, and P0141 are all for the heater circuits in 3 of the 4 O2 sensors.
P0717 is for the input/mainshaft speed sensor/circuit on the transmission.
P2649 is for the vtec solenoid high voltage.
The original four likely have nothing to do with the existing codes, but should be fixed. You mentioned a bad wire. Try to find the location of the damage, because it is possible other wires are damaged and causing the two new codes.
The codes don't necessarily mean to replace a sensor as something upstream like the wiring could be damaged. Since you have a scanner, look at the values and/or voltage the PCM is reporting from the sensors. This can help give you some direction. Testing for power and ground to the vtec and mainshaft sensor may help narrow down the issue.
Thread Starter
Joined: Mar 2025
Posts: 6
From: Southern Ohio
Based on your codes, is this a V6 engine?
The P0155, P0135, P0154, and P0141 are all for the heater circuits in 3 of the 4 O2 sensors.
P0717 is for the input/mainshaft speed sensor/circuit on the transmission.
P2649 is for the vtec solenoid high voltage.
The original four likely have nothing to do with the existing codes, but should be fixed. You mentioned a bad wire. Try to find the location of the damage, because it is possible other wires are damaged and causing the two new codes.
The codes don't necessarily mean to replace a sensor as something upstream like the wiring could be damaged. Since you have a scanner, look at the values and/or voltage the PCM is reporting from the sensors. This can help give you some direction. Testing for power and ground to the vtec and mainshaft sensor may help narrow down the issue.
The P0155, P0135, P0154, and P0141 are all for the heater circuits in 3 of the 4 O2 sensors.
P0717 is for the input/mainshaft speed sensor/circuit on the transmission.
P2649 is for the vtec solenoid high voltage.
The original four likely have nothing to do with the existing codes, but should be fixed. You mentioned a bad wire. Try to find the location of the damage, because it is possible other wires are damaged and causing the two new codes.
The codes don't necessarily mean to replace a sensor as something upstream like the wiring could be damaged. Since you have a scanner, look at the values and/or voltage the PCM is reporting from the sensors. This can help give you some direction. Testing for power and ground to the vtec and mainshaft sensor may help narrow down the issue.
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