P1260 = Theft Detected - Engine Disabled
This OBD Code indicates that the Passive Anti Theft system (PATS) detected a
"theft condition". This basically means an incorrect signal, or no
signal at all was received from the chipped key. Brief overview: your
ignition key has a chip in it called a transponder that is read by the
PATS transceiver (mounted around the ignition cylinder housing behind
the column shroud). The signal is then sent to the PATS control module,
which communicates with the Powertrain Control Module (PCM) and enables
the vehicle to start.
When an incorrect
signal is received, the PATS module then sends this message to the PCM
which triggers the P1260 trouble code, resulting in a no start
condition. Possible causes are: an incorrect key being used, faulty key
chip (transponder), wiring concerns between the transceiver module and
PATS module, the transceiver module itself or internal PATS or PCM
module concerns. The first thing to do in this instance is retrieve
codes from the PATS module and diagnose these. Once the PATS issues have
been resolved you can reset the P1260.
Communication with the PATS
module will likely need to be done at a Ford dealer. A few things to
check first: make sure the correct key is being used, and if you have a
second key, try that one as well. If one key starts it but not the
other, you may have a faulty key. If both keys do not work, then it is
not likely a key problem. Honestly, we see very few problems with the
keys themselves. Make sure no one has tampered with the steering column
shroud as the transceiver module located behind it is fairly fragile.
Lastly check for an aftermarket remote start system. These are a common
cause of no start problems with PATS equipped vehicles. Some installers
will remove the chip from your key and tape it to the column (under the
shroud). This basically bypasses the system and allows it to be started
without a chipped key. The problem is that the transponder removed from
the key is not designed to be used in this way and can fail due to
extreme temperature changes and, depending on mounting condition,
excessive vibration and shock. Other installers use a "key box"
installed under the dash, and these have been known to cause issues as
well. If you suspect the concern to be related to a remote start it may
not be a bad idea to have it checked or removed to complete diagnosis.
Also, its possible that you are interesting in check the Ford F-150 - Owners Manual (page 94)
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