Ford Explorer 2001 Tr Sensor Wiring Diagram
P0708 Transmission Range Sensor "A" Circuit High
OBD-II Trouble Code Technical Description
Article by
Daniel Young
ASE Certified Master Technician
Transmission Range Sensor "A" Circuit High
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
This is a generic powertrain diagnostic trouble code (DTC) in the transmission sub-group. It is a type "B" DTC which means that the powertrain control module (PCM) or Transmission control module (TCM) will not illuminate the check engine light until the conditions to set the code are detected on two consecutive key sequences. ( key on-off, off-on)
The PCM or TCM uses the transmission range sensor, also called the inhibitor switch, to determine the position of the shift lever. If it receives signals that indicate two different gear positions at the same time for more than 30 seconds P0708 will be set. If this occurs twice in a row the check engine light will come on and the transmission will be commanded into "fail-safe" or "limp-home" mode.
Example of an external Transmission Range Sensor (TRS):
TRS image from Dorman
Symptoms & Severity of Code
The check engine light will come on accompanied by an obvious lack of power taking off from complete stops due to the transmission starting in third gear.
Continuing to drive the vehicle could result in severe transmission damage. I recommend getting it repaired immediately to avoid costly internal transmission repairs.
Causes
Potential causes for this code to set are:
- Faulty transmission range sensor
- Misadjusted transmission shift cable/linkage
- Damaged wiring
- Misadjusted range sensor
- (Rarely) PCM or TCM failure
Diagnostic and Repair Procedures
The transmission range sensor receives a twelve volt signal from the ignition switch and sends a signal back to the PCM/TCM that is appropriate for the selected position of the gear shifter.
In my experience the most common causes of this code have been a faulty range sensor or misadjusted shift cable/linkage.
Checking this circuit is easiest with a scan tool but if one is not available there are still a few things you can check. Have the key in the on position with engine off. (KOEO) With a digital volt ohm meter you can check each return signal circuit individually by back probing at the sensor with it still connected. Have an assistant shift to each gear one at a time. Each signal circuit should have voltage in one position and one position only. If there is voltage present on any one circuit in more than one gear position suspect a faulty range sensor.
In my experience I have NEVER seen a PCM/TCM be the cause of any range sensor related DTC. This does not mean it is not possible, because it is, it is just not probable. However, I have seen a faulty PCM/TCM that was damaged by a short circuit in a range sensor. If you suspect a fault in the PCM/TCM make sure to look for the cause of the damage before installing a new one to avoid causing the same damage to it.
Related Transmission Range Sensor codes: P0705, P0706, P0708, P0708, and P0709.
Related DTC Discussions
- 97 Mazda 626 4 cyl AT OBD II code P0708
I need some help analyzing a problem with the dreaded Tranny that Mazda put into the 626. I have a 4.0 cyl A/T. Currently the car has about 221000 miles on it. It had a tranny change around 90,000 miles and a engine change around 160,000 miles. The problem I have now is after driving for a few minut... - P0795 - P0708 for 2001 Saturn SL2
The transmission was replaced about 6 weeks ago in the car because it was shifting in and out of overdrive erratically. After picking car up from mechanic, engine light was still on and transmission would shift to high gear and/or overdrive regardless of forward gear selection. (ie: D,2,L). After... - Explorer P1400 went to P0113, P0118, P0123, P0453, P0708 ...
Hi everyone, I am new to this forum and hope to find some help. I have a Ford 2002 explorer with a 4.0L. I had a P1400 code, took the DPFE sensor out to change it. BUT while it was disconnected, started the truck... :oops: It ran about 10 sec. before I stopped it. Then I connected the sensor back,... - Silverado P0708 code
I have a �11 Chevy Silverado Duramax that keeps throwing the po708 code. I changed out the harness, as the old one was oil filled. Still kept throwing the code. Changed out the range sensor, put one after market and one Allison one on and they both kept throwing the code. Put a different TCM on ... - P0708 / P0722 / P0717 on 2001 Hyundai Accent
Hey folks, I have a 2001 Hyundai Accent GS and after running my CEL through a reader, I got these codes. Can anyone help me out on what they mean? Thanks!... - P0708 Transmission Range Sensor High Circuit
[attachment=0]Screenshot_20210218-234635.png[/attachment]Kia Rio LX 2011. Got this P0708 code for the Transmission Range Sensor or the Inhibitor Switch Sensor come on. No Trans work done, just that the vehicle did a hard shift when it went up a small sloop. Afterwards I did the scan. This is a gen... - 2003 Ford Ranger obd2 code p0708
2003 Ford Ranger 3.0 p0708 code, what is it for?... - 97 f150 4x4 4.6 trouble codes P0743 P0708
Replaced motor in my truck, now speedometer not working and overdrive light flashing. Won't shift out if 2nd... - 07 Hyundai Sonota p0708
Code P0708... - 99 Windstar DTC P0708
Hi, Can someone please help: How to adjust the DTR (Digital Range Sensor)on the trans to lower the Voltage. Can I do it without the scanner? With Voltmeter. I knew it should be between 1.3 to1.8Volt. The funny thing is that it will normalize after running fo 5-10 min warm up i.e. the O/D OFF ...
Need more help with a p0708 code?
If you still need help regarding the P0708 trouble code, please post your question in our FREE car repair forums.
NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected.
Source: https://www.obd-codes.com/p0708
Posted by: jacqueklann.blogspot.com