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Home / DTC / P0793 — Intermediate Shaft Speed Sensor A Circuit No Signal

P0793 — Intermediate Shaft Speed Sensor A Circuit No Signal

Detailed page for trouble code P0793.

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Code

P0793

Generic P — Powertrain

Intermediate Shaft Speed Sensor A Circuit No Signal

Brand: Generic
Type: P — Powertrain
Views: UK: 17 EN: 21 RU: 16
AI status
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Page language: EN

Causes

  • Open or shorted wiring between sensor and PCM/TCM
  • Corroded/damaged connector or pins at sensor or control module
  • Failed intermediate shaft speed sensor (Hall or VR type)
  • No reference supply voltage or missing ground to the sensor
  • Mechanical problem preventing shaft rotation (damaged gear/tooth)
  • PCM/TCM internal fault or software error (less common)

Symptoms

  • Transmission malfunction lamp (MIL) or trans warning lamp illuminated
  • Harsh, delayed, or no shifting; transmission may go into limp mode
  • Cruise control and speed-dependent features may be disabled
  • No intermediate shaft speed reading in scan tool data or a steady zero value
  • Possible unusual noise or lack of engagement if shaft/gear damaged

What to check

  • Retrieve freeze frame and full list of stored transmission-related codes with a scanner
  • Inspect harness and connector at the intermediate shaft speed sensor for corrosion, bent pins, water intrusion, or damage
  • Visually inspect wiring route for chafing, pinches, or rodent damage between sensor and PCM/TCM
  • Backprobe sensor connector and check for reference supply (usually 5V or battery supply), ground continuity, and signal while cranking/rotating shaft
  • Scan-tool: monitor intermediate shaft speed PID and related speed sensors (input/output) for consistency
  • If available, use an oscilloscope to view signal waveform while rotating the shaft (preferred over simple DC meter)

Signal parameters

  • Hall/active (3-wire): reference supply typically ~5V, ground, signal is a square/TTL pulse switching between ~0–5V; pulse frequency increases with shaft speed
  • Passive/VR (2-wire): AC sine/alternating pulses; amplitude increases with RPM (can be tens to hundreds of millivolts at low speed, up to several volts at higher speeds)
  • Expected behavior: signal frequency or pulses should appear immediately when the intermediate shaft is rotated; absence of pulses = open/short or failed sensor
  • Typical resistance: varies by design — consult vehicle repair data; lack of expected resistance or infinite/open indicates failed sensor

Diagnostic algorithm

  1. Confirm P0793 and note freeze-frame data: vehicle speed, RPM, gear, conditions when code set
  2. Perform a visual inspection of the sensor, connector, and harness; repair obvious damage and retest
  3. Backprobe connector with ignition ON and engine OFF: verify sensor reference voltage and ground presence (for 3-wire sensors). If no reference/ground, trace to PCM and check power/ground fuses/relays
  4. Rotate intermediate shaft by hand or with starter/engine at idle (safe, vehicle secured) while monitoring signal wire with a DVOM (AC for VR sensors) or ideally an oscilloscope to confirm presence and shape of pulses
  5. If there is no signal at the sensor but reference and ground are present, disconnect sensor and measure resistance per service data; if out of spec, replace sensor
  6. If sensor tests good, perform continuity and short-to-power/ground checks between sensor connector and PCM pins; repair any wiring faults
  7. If wiring and sensor check good, try swapping with a known-good identical sensor (if available) or substitute a known-good PCM (rare; only after eliminating wiring and sensor faults)
  8. After repair or replacement, clear codes, perform a road test and re-scan to confirm code does not return and that shift behavior is normal

Likely causes

  • Broken/open signal wire or connector corrosion
  • Failed speed sensor
  • Lost sensor reference power or ground
  • Intermittent connector contact or wiring chafe

Fault status

⚠️ Status
P0793 - Intermediate Shaft Speed Sensor A Circuit No Signal (transmission intermediate shaft speed sensor not reporting)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0720 P0715 P0722 P0725 P0791
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